Four people were fatally shot on a Chicago Transit Authority train early on Labor Day while they appeared to be sleeping in separate train cars. The incident occurred at approximately 5:30 a.m., with three victims pronounced dead at the scene and the fourth later dying at a hospital. Authorities have arrested a suspect, who was apprehended about 90 minutes later on another train, and a firearm has been recovered. Surveillance footage showed no prior confrontation, leading police to believe it was a random attack. The victims have not been publicly identified, but there is speculation that they may have been homeless. This shocking incident has raised safety concerns among local residents and prompted calls for increased resources for community safety.