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An officer was on patrol in Aurora early Thursday morning when he heard gunshots nearby, police said.
According to Aurora Police Department spokesman Dan Ferrelli, the officer was patrolling near Galena Boulevard and West Street around 2:35 a.m. when he heard several gunshots go off just to the east of him.
The officer found spent shell casings on the sidewalk in front a home in the 500 block of East Galena Boulevard.
Ferrelli said no one and nothing appeared to have been struck by bullets.
Anyone with information is asked to call Aurora police investigators at 630-256-5500 or Crime Stoppers at 630-892-1000.