New Delhi, Oct. 17 -- A day after four people were killed at an elementary school in Bend, Oregon, police have identified the shooter as 16-year-old Griffin J. John II.

According to authorities, John was once a special needs student at Silver Rail Elementary, the same school where he killed three students and a 25-year-old teacher. Authorities added that he attacked a classroom full of special needs students.

AP, citing City of Bend Police Chief Mike Krantz, said that the teen shooter fired as many as 15 shots from a 12-gauge shotgun and had about 44 rounds remaining when he was killed.

As investigators try to determine the motive behind the shooting and how the 16-year-old obtained the pump-action shotgun, Krantz said, "Everyone wants...