Man, 23, critically injured after stabbing in the Loop

CHICAGO - A man was in a large crowd in the Loop Friday night when he was attacked and stabbed. 

Police said the 23-year-old victim was found on the sidewalk in the 300 block of South Dearborn Street at 9:07 p.m. with a cut to her left arm. 

The victim told responding officers that he was in a crowd when someone he didn't know attacked him with a knife before fleeing. 

A knife was found near the victim. He was transported to Northwestern Memorial Hospital in critical condition. 

No arrests have been reported. Area detectives are investigating.