Authorities say a man was critically wounded in a shooting at a suburban Chicago mall, and the suspect remains at large.

Orland Park Police Chief Tim McCarthy tells WBBM-AM the 19-year-old man was shot in the center of Orland Square Mall and ran away before collapsing outside a clothing store Monday evening.

Deputy Police Chief Joseph Mitchell said at a brief news conference that the shooter remains at large and was believed to have fled from the mall area. Mitchell says investigators don’t know a motive for the shooting but called it an “isolated incident.”

Police departments from several neighboring towns responded to the mall about 20 miles (32.2 kilometers) southwest of Chicago.