The shooting appeared to be random, police said. The suspect was found on another train and police recovered a weapon.

Authorities are searching for answers after a suspect was arrested in the fatal shooting of four passengers who appeared to be sleeping on a Chicago Transit Authority train early Monday morning.

Victims of a shooter who took to a Chicagoland train on Labor Day were asleep when the gunman opened fire, killing four people. The suspected shooter was then arrested on a different train that same morning.

Police say four people have been fatally shot on a commuter train outside Chicago. The shooting occurred at the Forest Park station, an above-ground stop on the Chicago Transit Authority’s Blue Line route.

A Chicago Transit Authority employee was the person who discovered the four people fatally shot on two Blue Line train cars early Monday morning, according to a police report. Prosecutors revealed new details on Wednesday about the quadruple fatal shooting on the Blue Line train shortly before 5:30 a.

Four people fatally shot on a commuter train in the Chicago area early Monday appeared to be attacked while asleep in their seats, police said in an afternoon update.

A Chicago man is now facing multiple murder charges after he allegedly shot and killed four people on a CTA Blue Line train in what police are calling a "random act of violence."

The victims were discovered in the Chicago suburb of Forest Park, police said, at the end of the CTA’s Blue Line.