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Naperville police are investigating a report of a flasher at the Nichols Library downtown.
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According to police, a woman said a man in his late 30s or early 40s exposed himself to her in the library on Aug. 31 at 2:50 p.m. The incident happened while the woman worked at a desk on the second floor, police said.
On Tuesday, Naperville police announced that Crime Stoppers had offered a $1,000 reward for information that leads to an arrest.
Tips can be left with Crime Stoppers at 630-420-6006.