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The man who sexually assaulted a 6-year-old girl at a North Side discount store Monday night is believed to have fondled 12 other girls in incidents dating to August 2001, police said Tuesday.

Monday’s assault was the fifth at a Village Discount Outlet store, police said. The store’s owner is offering a $5,000 reward for the arrest and conviction of the offender and said Tuesday in a statement that more off-duty Chicago police officers had been hired for “heightened security.”

Anyone with information is asked to call police at 312-492-3810.