a coueremain at this memorial. it marks the spot where this mother was brutally beaten. answers for a lowell family. a mother beaten in front of her disabled son. >> she was a great mother to her kids. and, unfortunately, right now we lost a -- >> the woman was attacked by people, both men and women according to witnesses. her 28-year-old son who has down syndrome tried to protect his mother. he held her battered body after the attack. >> he held his mother, calling mommy. >> party saturday night at this apartment complex. asked to leave after exchanging words with other partygoers. it continued outside where witnesses say she was punched and kicked. there are reports a crowbar or a tire iron may have also been used. the son telling family members -- >> hit mom and blood all this blood. >> no arrests have been made yet, but the victim's family says they know who was behind the attack. >> very devastating. >> i don't know what i'm going to do with myself. be strong for the kids. >> lowell police, state police working with the d.a.'s office. people have been interviewed, b