NEW YORK (AP) -- A 13-year-old boy had just finished painting graffiti near railroad tracks when he was struck and killed by a commuter train, authorities and friends said Saturday.

A Long Island Rail Road train hit Ari Kraft between stations in Queens during the evening rush hour Friday, police said.

The city's medical examiner said he died of "blunt impact injuries to the head, torso and extremities."

The teen and three friends had been painting on the elevated tracks near a station, his friends said. As he crossed the tracks to head home, the train, carrying about 1,000 people, slammed into him.

Train service was suspended for hours.

Friends said he often created large murals with inscriptions like "Remember 9/11" -- under the tag name "Corporal."