Four people who appeared to be sleeping on a Chicago （1. commute ） train were （2. fatally ）shot Monday morning, and a suspect has been taken into （3. custoty ），police said.
“The victims, they were all passengers on the train early this morning,” said Forest Park Deputy Chief Chris Chin. “The train was in （4.running ） on the way into Forest Park.”
The victims may have been homeless, Chin told CNN. Investigators are working with the Chicago Transit Authority to review （5. image ） footage of the shooting, which police said happened in two train cars: three in one car and the fourth in another.
