CHICAGO (CBS) — A man is dead after being pushed in front of an oncoming train on the Red Line subway downtown late Tuesday afternoon, police said.

Around 5:13 p.m., a man was on the Chicago Transit Authority platform at the Jackson Red Line stop when three assailants came up to him, police said.

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The assailants pushed the man in front of a train and he was struck, police said.

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He was pronounced dead at the scene.

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As of late Tuesday, no one was in custody. Area Central detectives were investigating.