A bomb exploded in a teenager's bedroom, killing the boy and seriously injuring his mother. "Right now we are considering it a homicide investigation," said State Police Sgt. Steve Brown. Brown would not comment on reports the bomb was contained in a parcel delivered by United Parcel Service, but police searched a UPS truck two miles south of Fair Haven. Christopher Marquis, 17, died after being taken to the Rutland Regional Medical Center, police said. His mother, Sheila Rockwell, 52, suffered a serious leg wound, injuries to her torso and lost part of a hand, State Police Capt. Dean George said. She had been in her son's room when the explosion happened at the home directly behind the police and fire departments. Other areas of the one-story ranch house were not seriously damaged.