Apr 23, 2013 8:50 AM
BOSTON (AP) - He's already been charged with using a weapon of mass destruction, in the Boston Marathon bombings -- but more charges are ahead for Dzokhar Tsarnaev.
State prosecutors expect to charge him separately in the killing of an MIT police officer who was shot in his cruiser Thursday night on the school's campus in Cambridge.
Federal prosecutors could also add new charges when he's indicted in the bombing.
Still unable to speak because of wounds, Tsarnaev answered questions in writing yesterday.
U.S. officials say Tsarnaev and his brother appear to have been motivated by their religious views, not any connection to any Muslim terrorist groups.