and michael finney, we appreciate your time and we will see you again in half an hour. >> bye-bye. the breaking news. in philadelphia, the fbi now called in on the train derailment. the train conductor revealing new information about what she may have heard. was the engineer or train hit by some type of object? and the acceleration in the final seconds. also developing, the reaction coming in now. the boston bomber sentenced to death. and the bomber's family. what they're now vowing to do. the reported tornado. severe storms hitting as we come on the air. 40 million bracing for a dangerous 24 hours. the abc news exclusive. bill cosby, breaking his silence for the first time, right here. and the mystery fire near the vice president's house. the wealthy family gone. late details coming in. and, we remember an american legend. there was no one like him.

good evening, it's great to have you with us on a friday night. we begin with the breaking news from philadelphia. tonight, the fbi now on the case. and the new video showing the moments before the amtrak train derailed. mysteriously speeding up as it approached that curve. and late word about what the conductor may have said. david kerley has the story. >> reporter: tonight, a look at the last seconds of amtrak 188 on the rails. racing past a closed circuit camera at more than 100 miles an hour. then just the flash of the derailment. was this train hit in the windshield by a projectile? a conductor on the train heard the engineer talking on the radio about possibly being hit like another train in the area. investigators talked to the 32-year-old engineer late today. >> he was specifically asked

that question, and he did not recall anything of that sort, but there again, he does not have any recollection of anything past north philadelphia. >> reporter: but on the engine windshield there is an unusual round fracture. the fbi is being called in to investigate that crack. >> at this point do we have any other information to corroborate a projectile or anything shooting at either of the trains, we are having the fbi to go out and examine the fracture pattern in the windshield. >> reporter: could that explain the sudden acceleration partially seen in these new pictures obtained by our station wpvi? ten minutes out of philadelphia it's at the speed limit. 70 miles an hour. then in the final minute, a quick acceleration, 80 miles an hour, then 90. just 16 seconds before derailment, more than 100 miles an hour. reaching that 50-mile-an-hour curve. the brakes are applied but it is too late. >> and david is with us live. what will the fbi's first move

be? >> they want their help with forensics. if you look at the windshield, you can see a crack. but the engine rolled over, and i thought it was just from that action. they'll look at the mark on the windshield. did it come from something other than the roll? was it a projectile? could that have contributed to the derailment? >> david, thank you. and in the meantime tonight, we turn to the breaking news out of boston. judgment day for dzhokhar tsarnaev, sentenced to death. the jury deliberating less than 15 hours. tsarnaev, never looking at the jury, showing no emotion as the verdict was read. and the images many believe may have sealed his fate. including this one. in the holding cell, proof, they say, he felt no remorse. in that courtroom tonight survivors, some lobbying for life sentence.

saying a death sentence would bring years of appeals. and his family vowing to fight to save his life. tom llamas has the story. tom, good evening. >> reporter: david, good evening to you. dzhokhar tsarnaev now knows where his path of terror will likely end -- in the execution chamber. 21-year-old dzhokhar tsarnaev is now the youngest person on federal death row. all 12 jurors deciding he must die for his crimes. liz norden has been in court almost every day. her sons each lost a leg in the bombing. >> i feel justice for my family. i felt the ultimate justice was the death penalty. >> reporter: prosecutors argue he was unrepentant. showing jurors video of the bomb's chaotic aftermath. the most damaging evidence, this photo, showing him planting the bomb four feet from a row of children. including 8-year-old martin richard, who was killed. and this video, shot just 20 minutes after the blast.

tsarnaev casually shopping for milk. and this video, taken three months after the bombing. tsarnaev making an obscene gesture in his cell. proof, prosecutors say, he's not remorseful. >> today, the jury has spoken. and dzhokhar tsarnaev will pay for his crimes. >> reporter: the defense tried to paint him as a gentle boy and friendly teenager that was led into jihad by his brother. they said he feels true remorse. calling as a surprise witness, anti-death penalty crusader, sister helen prejean. she met with him five times, and testified that he's genuinely sorry. but others are unconvinced. first responder michael ward jumped into action the day of the bombing. >> he wanted to go to hell, and he's going to get there early. >> and tonight, abc news has reached tsarnaev's father south of russia.

he tells us, "we will fight. we will fight. we will fight until the end." david? >> tom, thank you. and dan abrams with me now. is there any question of an appeal here? >> no question, it will start fast, and take a long time. it could take years if not decades. and remember, the best he could hope for, a new trial. and that's unlikely. >> and you were telling me the defense moving forward will likely focus on three jurors? >> they seem to have accepted the heart of the defense's argument. which is, he wouldn't have done this if not for his brother's influence. they still voted for death, but i expect the attorneys are going to focus on them in particular. >> and you point out, it could be years, if not decades ahead. dan, thank you. and 40 million americans bracing for a blast of severe weather tonight into tomorrow. tornado watches. colorado, nebraska, wyoming. and reports of twisters already touching down. this funnel cloud, on highway 52 near denver.

listen to this. the hail making for a miserable drive home. flash flood watches from southern california to oklahoma. this highway under water. and cars in fresno stranded. water up to the hood. a mother and son getting out just in time. and in west hollywood, california, drenching rains. a waterfall on the staircase. rob marciano from texas tonight. >> reporter: tonight, severe storms firing up. this funnel cloud in colorado. downed trees and a tornado reported near corpus christi, texas. people sheltering in this basement. near houston, over a half-foot of rain in the past 72 hours. the san jacinto river inching closer to this house. >> every time it floods like this it gets closer and closer. >> reporter: a nearby lake full, officials releasing water from this dam. south of san antonio, high winds and heavy rain being blamed for this massive freight train derailment. miraculously, no one injured.

record rain out west, too. this los angeles stairwell turning into a waterfall. in fresno, tasha jones and her son escaping their nearly submerged vehicle. >> as a parent, the horrific part was seeing the fear on my child's face, trying to save us and get us out of the water. >> reporter: this western storm bringing over 7 inches of snow to the arizona mountains. it is that western storm that has the central u.s. prepping for a rough weekend. tonight, a tornado watch out for western nebraska, and that zone expands to north texas tomorrow. and on sunday, minneapolis, chicago getting into the severe weather mix. here in denton, texas, the flood gates of this dam being opened in anticipation of more rain this weekend. david? >> rob, thank you. now, to tragic news out of nepal. the six missing marines, their helicopter vanishing after trying to help out after the

deadly earthquake. tonight, the worst fears realized. wreckage found, it's unlikely anyone survived. terry moran has the story. >> reporter: today, deep in the remote and rugged himalayan terrain, they found the wreckage. >> based on what we saw and the condition of the aircraft, we believe there were no survivors. >> reporter: it was one of these helicopters. onboard, six u.s. marines, two nepalese. delivering supplies for those in need from the devastating earthquakes here. two bodies recovered today, none yet identified. families so far have only been told their loved ones were on board. this was the pilot, his family speaking tonight. >> i love you, chris. i'm proud of you. >> reporter: among those lost, this sergeant. and the day before the crash, this video shows others also reportedly missing.

>> uh-1 yankee pilot here. we're able to deliver some rice, potatoes, and tarps to smaller villages. >> reporter: they all answered the call of duty. terry moran, abc news. >> terry, thank you. and now to iraq. ramadi overtaken by isis. their black flag flying over the city. the terror group seizing government headquarters and mosques. families fleeing amid reports of suicide attacks and mass executions. and back at home, in illinois, new video sparking allegations of excessive force by this police officer. two teenagers sitting motionless in a holding cell. the officer appears to douse them with pepper spray. the boy on the right clearly in pain. and that officer under investigation tonight. and in miami beach, disturbing text messages and e-mails revealed. hundreds of cases being re-examined. steve osunsami with some of those e-mails tonight.

>> reporter: tonight, 16 miami beach police officers are having to explain themselves after being caught up in a racist and sexist e-mail scandal. >> and quite a few videos that are graphic pornography. >> reporter: their bosses say one of the photos is this photoshopped picture of a toddler holding the sign "dad" at a black history month parade, with a group of black men running away. and "black monopoly," where every space leads to jail. there was the "n"-word, the "f"-word, and plenty of porn. prosecutors say they now need to re-examine 540 cases where the officers were involved. women and african-americans are defendants in more than a third of the cases. >> this conduct seems to have been accepted within the department. >> reporter: investigators say the writers with the most enthusiasm were lt. alex carula, fired thursday, and major angel vazquez, who retired last year. tonight, police in san francisco are also investigating 14 of their officers after discovering racist and homophobic text messages. in ft. lauderdale, they just

fired three officers and one retired for similar offenses. >> it jeopardizes criminal cases because these officers cannot be credible witnesses or arresting officers. >> reporter: in most of these cases, the messages were sent on city phones and e-mail accounts. david? >> steve osunsami, thank you very much. and now to an abc news exclusive tonight, bill cosby finally breaking his silence. after months after allegations. sitting down with linsey davis in alabama, where he was meeting with students. take a look. >> reporter: if a young person comes up to you and says, you know, my mom says you've done some bad things, how will you answer them if they are pressing you? are you guilty? did you do it? are the allegations true? >> i'm not sure they will come like that. i think that many of them say, well, you are a hypocrite. you say one thing. you say the other. my point is, okay, listen to me

carefully. i'm telling you where the road is out. now, you want to go here or you want to be concerned about who is giving you the message? >> reporter: more than 30 women coming forward in recent months. some accusing cosby of drugging or sexually assaulting them. cosby has never been criminally charged. and through his representatives has denied the allegations. some of your biggest supporters have said they are concerned about your legacy. what would you like your legacy to be? >> i really know about what i am going to do tomorrow. i have a ton of ideas to put on television about people and their love for each other. >> reporter: cosby, optimistic for the future but still reluctant to address or discuss the allegations about his past. linsey davis, abc news, montgomery, alabama.

still much more ahead on "world news tonight" this friday. breaking news at this hour. late developments coming in in the mystery mansion fire not far from the vice president's house. the well yn family gone. what did they discover in that home? the iconic american toy store now closing. we'll tell you why. and our yearlong investigation. the family that had no idea the airbag in their car was counterfeit, until our test. we'll be right back. my constipation and belly pain have my stomach feeling all knotted up. i've tried laxatives... but my symptoms keep returning. my constipation feels like a pile of bricks...

that keeps coming back. linzess can help. once-daily linzess treats adults with ibs with constipation or chronic constipation. linzess is thought to help calm pain-sensing nerves and accelerate bowel movements. linzess helps you proactively manage your symptoms. do not give linzess to children under 6 and it should not be given to children 6 to 17. it may harm them. don't take linzess if you have a bowel blockage. get immediate help if you develop unusual or severe stomach pain especially with bloody or black stools. the most common side effect is diarrhea, sometimes severe. if it's severe, stop taking linzess and call your doctor right away. other side effects include gas, stomach-area pain and swelling. bottom line, ask your doctor about linzess today.

bring us your aching and sleep deprived. bring us those who want to feel well rested. aleve pm. the only one to combine a safe sleep aid... plus the 12 hour pain relieving strength of aleve. be a morning person again with aleve pm. next tonight, our yearlong investigation. more than a $1 trillion industry. counterfeit goods you may not even know you had. we certainly didn't. we got access to the secret warehouses, seizing counterfeit goods, prescriptions that could easily end up in your medicine cabinet. tonight, the family that had no

idea their airbag was counterfeit. tonight, investigators will reveal the counterfeit goods in every corner of your home. what to look for in your smartphone, the bike helmet, toothpastes with antifreeze. and the makeup, what's really inside. and this family, stunned by their airbag. and our test. >> we're the larsons. i'm bob, this is my wife tammy. >> they bought the car used, knowing they had to replace the airbag. what they didn't know, it was from this guy. the man that owned that home in north carolina. who tonight is behind bars. look at what investigators said they found in his home. more than 1,500 fake airbags, $60,000 in cash hidden in the walls. authorities said he he sold $1.5 million worth on ebay.

calling himself airbag pros. labeled a top-rated seller. >> we found out later, the guy that sold us an airbag sold us a bum bag. >> we offered to have their car towed to a dealer, to have it replaced. and we're about to test their airbag. first, they set off a real airbag. and now, the airbag in the larsons' car. >> 2, 1. wow! >> a lot of shrapnel. you would have had a face full of plastic. >> we have a piece of the airbag cover over here. this is probably about 40 feet from the actual explosion of the airbag. can you imagine this being in the driver's face? >> and that's just one moment in the hour tonight. the investigation breaks just hours from now. we'll see what we found in the make-up, helmets, phones, and the storefronts selling canada drugs. did any of it really come from

canada? and what was inside of it when it arrived? the e-mail said it was cheaper, but was any of it real? that's tonight on "20/20," at 10:00 p.m. when we come back, a giant scare. a mother telling her children to get inside. in front of their house, a giant alligator. and the mystery fire near the vice president's home. new details. and do you remember this famous scene? which toy store this is in america? word tonight coming in, it's closing. ♪ ♪ ♪ ♪ ♪

everybody's moving to garmin. find the garmin that fits your life and join the movement. ugh... ...heartburn. did someone say burn? try alka seltzer reliefchews. they work just as fast

and are proven to taste better than tums smoothies assorted fruit. mmm... amazing. yeah, i get that a lot. alka seltzer heartburn reliefchews. enjoy the relief. ♪ ♪ [ male announcer ] you wouldn't ignore signs of damage in your home. are you sure you're not ignoring them in your body? even if you're treating your crohn's disease or ulcerative colitis an occasional flare may be a sign of damaging inflammation. and if you ignore the signs, the more debilitating your symptoms could become. learn more about the role damaging inflammation may be playing in your symptoms with the expert advice tool at crohnsandcolitis.com. and then speak with your gastroenterologist. incredible! i've been claritin clear for ten days. when your allergy symptoms start, doctors recommend taking one claritin every day of your allergy

season for continuous relief. with powerful 24-hour, non-drowsy claritin live claritin clear. every day. to the "index" on a friday night. new developments in the mysterious fire in washington, d.c. a $4.5 million mansion. blocks from the vice president's home. three adults and a child inside. they did not survive. authorities finding no signs of forced entry.

three victims with signs of injuries. they're looking at a porch that was set on fire. and now, f.a.o. schwarz, an iconic toy store. you all remember this tom hanks on the giant piano in the movie "big." word it's closing its flagship location in new york, blaming the rent. and here, just listen to mom. >> get back in the house. >> the gator heading up a neighbor's driveway. two kids, at least they listened to mom. when we come back, america singing the blues this friday as we remember a great, b.b. king. in a moment.

only nexium 24hr gives you nexium level protection for frequent heartburn all day and all night. try nexium 24hr, the #1 prescribed acid-blocking brand, and get all day, all night protection. nexium level protection. ♪ to you, they're more than just a pet. so protect them... ...with k9 advantix® ii. it's broad-spectrum protection k ills fleas ticks and mosquitoes too. k9 advantix® ii. for the love of dog™. caring for someone with alzheimer's means i am a lot of things. i am his sunshine. i am his advocate. so i asked about adding once-daily namenda xr

to his current treatment for moderate to severe alzheimer's. it works differently. when added to another alzheimer's treatment, it may improve overall function and cognition. and may slow the worsening of symptoms for a while. vo: namenda xr doesn't change how the disease progresses. it shouldn't be taken by anyone allergic to memantine, or who's had a bad reaction to namenda xr or its ingredients. before starting treatment, tell their doctor if they have or ever had, a seizure disorder, difficulty passing urine liver, kidney or bladder problems, and about medications they're taking. certain medications, changes in diet, or medical conditions may affect the amount of namenda xr in the body and may increase side effects. the most common side effects are headache, diarrhea and dizziness. he's always been my everything. now i am giving back. ask their doctor about once-daily namenda xr and learn about a free trial offer at namendaxr.com. you drop 40 grand on a new set of wheels, then... wham! a minivan t-bones you. guess what: your insurance company will only give you 37-thousand to replace it. "depreciation" they claim.

"how can my car depreciate before it's first oil change?" you ask. maybe the better question is why do you have that insurance company? with liberty mutual new car replacement, we'll replace the full value of your car. see car insurance in a whole new light. liberty mutual insurance. sunday dinners at my house... it's a full day for me, and i love it. but when i started having back pain my sister had to come help. i don't like asking for help. i took tylenol but i had to take six pills to get through the day. so my daughter brought over some aleve. it's just two pills, all day! and now, i'm back! aleve. two pills. all day strong, all day long. and for a good night's rest, try aleve pm for a better am.

finally tonight here, remembering an american master. the king of blues, born in the mississippi delta. he had a profound influence on so many. there was only one b.b. king. >> i was told that some of you dudes don't know anything about blues. >> the blues was in his name. nicknamed blues boy, which became b.b. ♪ >> that sound, uniquely his. his biggest hit, "the thrill is gone." ♪ the thrill is gone ♪ ♪ thrill is gone ♪ >> he said through the years, his fans would treat him like his last name, king. ♪ everyday i have the blues

everyday, i have the blues ♪ >> his partner through it all, his guitar, lucille. he would say, his one true love. and eric clapton. posting this message tonight. >> there are not many left that play in the pure way that b.b. did. and i thank him from the bottom of my heart. >> that singular voice, defining the blues. ♪ yeah ♪ >> taking a final bow there, b. >> tonight, bay area thieves targeting hybrid cars >> an arrest for the murder of a vallejo teenager his family vents their anger at police and the school he was afraid to attend. >> frightening new information

about the strength of the steel in the bart tracks how many rails could fail? >> and a death sentence in the boston bombing trial. a split decision among bay area marathon runners. >> abc7 news learned about a rash of new expensive thefts in the bay area. batteries from hybrid cars. good evening. >> these thieves appear to be knowing what they're doing. >> a long time ago thieves were stealing catalytic converters from cars, then air bags, and now, hybrid car batteries. san franci're just becoming aware of the increasing problem. this is what john's toyota looked like when he went to his

parked car. >> passenger rear window was broken into. inside, everything is just a mess. it looks like a tornado went through. >> it wasn't a tornado. it was a burglar, who made his way into the back of the car and stole the 150 pound battery that powers his engine. he learned there had been a rash of the thefts in the city. >> an insurance adjuster said wait a minute, i had three cases i'm working on for the same problem. >> same thing here at jp auto body garage. they've also been busy replacing batteries on toyota prius. this mechanic showed us batteries. he disbelieve the