Philadelphia teen shot, killed, 2 others and 7-year-old boy wounded in quadruple shooting

A teenage boy was shot and killed in Philadelphia on Thursday, and two other teens and a 7-year-old child were wounded in a quadruple shooting. 

The 17-year-old was shot once in the head and taken to the Einstein Medical Center, where he died. 

Two other teens, ages 15 and 16, had gunshot wounds. The 15-year-old was shot in the head and back and the other teen was shot in the shoulder. 

The 16-year-old is listed as stable and the 15-year-old is in critical condition. The youngest victim, the 7-year-old boy, was shot in the leg.