4 dead in shooting on commuter train in Forest Park, Illinois, outside Chicago

FOREST PARK, Illinois — Four people were shot dead on a CTA Blue Line train outside Chicago on Monday morning, police said.

Forest Park police said they received a 911 call around 5:27 a.m. reporting that three people had been shot on a train at the CTA Blue Line Forest Park station at 711 Desplaines Avenue.

When officers arrived at the scene, they found four gunshot victims. Three of them were pronounced dead at the scene and a fourth was taken to Loyola University Medical Center where he later died.

Police said the suspect fled the scene and was arrested on a CTA Pink Line train in Chicago after receiving a description from surveillance video.

“A weapon was recovered,” Chris Chin, deputy director of Forest Park, told reporters. “There is no immediate threat. This appears to be an isolated incident on this unfortunate day.”

Forest Park police and the West Suburban Major Crimes Task Force are investigating. Police said this appears to be an isolated incident and there is no major threat to the public.

The CTA said in a statement: “Although this was an isolated incident, this heinous and outrageous act of violence should never have taken place on a public transport train.

“As soon as this incident was reported, CTA immediately committed resources to assist Forest Park Police with their investigation. This included reviewing all possible surveillance camera footage, which proved critical in assisting local law enforcement.

“We commend both the Forest Park Police Department for their thorough and cooperative efforts in providing information to partner agencies, as well as the Chicago Police Department, whose quick actions led to the arrest of a suspect in this matter.

“CTA will continue to cooperate with local law enforcement as part of this ongoing investigation.”

The Associated Press contributed to this report.