Chicago police say three people have been killed and another 20 have been injured in separate shootings over 13 hours overnight.

Police say the shootings happened late Friday and early Saturday.

A 29-year-old man was killed in a drive-by shooting across from a North Side high school about 1:20 a.m. Saturday. He was shot in the chest and back. No suspects are in custody.

Another man was shot on the southwest side at 4 a.m. And two women were shot in the head on the West Side. Police say one woman was found unresponsive at the scene. The other woman’s condition wasn’t known.

The injured victims included at least 10 teenagers, including a 15-year-old accidentally shot by a man who was showing him a gun.