SILVER SPRING, Md. -- The gunman who shot and killed a 14-year-old boy on a Montgomery County bus may have left behind a black hooded sweat shirt, police said.
Montgomery County police released a photo of the sweat shirt, which features an image of the cartoon character Marvin the Martian.
Three teenagers were injured in the shooting.
Tai Lam died at a hospital. Two other boys were treated at a hospital.
Investigators believe the shooting suspect was a man in his early 20s with a tattoo of some lettering on his neck.
