Chicago weekend gun violence leaves multiple dead and injured in shootings.

At least 21 people have been shot, one fatally, in gun violence across Chicago so far this weekend, police said. Last weekend, at least 26 people were shot, eight fatally, CPD said. The incidents include a shooting on a CTA Red Line train and a 17-year-old boy being shot and killed on Chicago's Northwest Side. No one is in custody for most of the shootings, and police are investigating.