CHICAGO (CBS) — Police were looking for an assailant Tuesday evening after a man was stabbed at the Jackson Red Line stop in the Loop.

At 6:06 p.m., two men got into a quarrel on the platform at the station, beneath Jackson Boulevard and State Street.

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One of the victims was stabbed in the hip with an unknown object, police said. He was taken to Northwestern Memorial Hospital in good condition.

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No one was in custody late Tuesday, and Area Central detectives were investigating.

Last month, a man shot three people – killing one – in the tunnel that connects the Jackson Red Line station with the Blue Line station a block to the west.

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A street performer was also attacked by a woman with a knife at the station last month, police said at the time.