4 shot dead on train in Chicago; suspect held

At least four people were shot dead on a train in the US city of Chicago on Sept 2, police said, and a suspect was apprehended soon after the incident.

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Police said they responded to a 911 emergency hotline call early on the morning of Sept 2 and found the four victims when they arrived at the Forest Park train station.

"Three were pronounced dead on scene, the fourth was transported to Loyola University Medical Centre in Maywood, where they were later pronounced dead," a police statement said.

Gun violence is common in the US, a country where there are more firearms than people. Attempts to clamp down on gun rights are always met with stiff political resistance.