Nine people were shot, two fatally, Thursday outside a Chicago McDonald's. Police have a suspect.
A altercation between two groups at 10:41 p.m. led to rounds fired into the crowd, Chicago Police Superintendent David Brown said Friday.
The fight's cause is unknown, said Brown.
Brown said a lady leaving with the suspected gunman touched the third rail and was hospitalised.
Police haven't identified the person who gave the shooter the pistol from security video. Police said a gun was found.
If the individual who did this doesn't have a gun, this is simply a personal issue
"It's sad and unacceptable that guns are in the hands of individuals who don't care about themselves or others," Lightfoot added.