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.

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.

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.

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