A total of 12 people have been shot in Philadelphia's Grays Ferry neighborhood, leaving three people dead, police said.

The shooting was one of several episodes of gun and knife violence in the city over the Fourth of July weekend.

Victims included a 15-year-old girl, two 17-year-old boys, and several adults. Three men — ages 19, 23 and 24 — were killed. A 19-year-old man who was shot twice in the head remains in critical condition.