Authorities say a man was shot and killed at a suburban Chicago mall and the suspect remains at large.

Orland Park police say the 19-year-old was shot in the center of Orland Square Mall and ran away before collapsing outside a clothing store Monday evening. The man later died at the hospital.

Deputy Police Chief Joseph Mitchell says a bystander suffered a graze wound to the leg and was being treated at another hospital.

Mitchell says security video showed a male shooter fleeing the mall but it's unclear if he continued on foot or got into a vehicle. Mitchell calls the shooting an "isolated incident," saying the video shows the two people involved knew each other and that the victim was "targeted."

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Police departments from several neighboring towns, as well as the FBI and ATF responded to the mall about 20 miles southwest of Chicago