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In the July 1 incident, a man pointed a gun, which was originally thought to be a handgun but was later determined to be a pellet gun, at two store clerks and a customer. He demanded money inside the store at 6090 S. Park Avenue, police say. When an armed customer intervened, the man dropped the gun. 

The man fled on foot with an undisclosed amount of cash and several cigarette cartons, according to the police department.

Detectives determined the man is in his 30s or 40s, around 6-feet-1-inches tall and 240 pounds with a shaved head and goatee.

Anyone with information on the identity or location of the man is asked to call 911 or 88-CRIME, an anonymous tipster line.