we just don't need. >> reporter: the shooters, sayeed rizwan farook, a 28-year-old u.s. citizen and his wife tashfeen malik, a 27-year-old u.s. permanent resident were not previously known to the fbi. and were not on a list of potentially radicalized people. however, law enforcement officials say that farook was in contact by phone and social media with international terrorism subjects under fbi investigation. the subjects were not considered high priority. investigators are also examining farook's travel to pakistan and saudi arabia. where it is believed that farook met his wife malik during the annual muslim pilgrimage, the hajj. malik, who was born in pakistan, eventually came to the u.s. on a k-1, or fiancee visa before obtaining a greencard. farook's brother-in-law says he is stunned by wednesday's bloodshed. >> i have no idea why would he do that. why would he do something like this? i have absolutely no idea. i am in shock myself. >> reporter: police are now working at the couple's home to determine how they managed to amass an enormous arsenal. two assault rifles

we just don't need. >> reporter: the shooters, sayeed rizwan farook, a 28-year-old u.s. citizen and his wife tashfeen malik, a 27-year-old u.s. permanent resident were not previously known to the fbi. and were not on a list of potentially radicalized people. however, law enforcement officials say that farook was in contact by phone and social media with international terrorism subjects under fbi investigation. the subjects were not considered high priority. investigators are also examining farook's travel to pakistan and saudi arabia. where it is believed that farook met his wife malik during the annual muslim pilgrimage, the hajj. malik, who was born in pakistan, eventually came to the u.s. on a k-1, or fiancee visa before obtaining a greencard. farook's brother-in-law says he is stunned by wednesday's bloodshed. >> i have no idea why would he do that. why would he do something like this? i have absolutely no idea. i am in shock myself. >> reporter: police are now working at the couple's home to determine how they managed to amass an enormous arsenal. two assault rifles