Dzhokhar Tsarnaev was seen on campus , at party after marathon bombings . Younger brother was found hiding in boat after manhunt . Authorities sought brothers after analyzing photos from scene . Comment:
Dzhokhar Tsarnaev was seen on campus , at party after marathon bombings . Younger brother was found hiding in boat after manhunt . Authorities sought brothers after analyzing photos from scene . Older brother died in shootout , was run over by Tsarnaev , police say .