Officers responded just before 2:30 a.m. to an alley in the rear of a home on the 4200 block of Castor Avenue after several reports of gunshots fired.
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They discovered blood and shell casings behind the home.
Investigators went to Einstein Medical Center to talk to a man who showed up with a gunshot wound to the hand.
He told police he was handling his 22 Caliber, Mossberg Rifle preparing the gun for a sale when he accidentally discharged the rifle inside his basement.
He then transported himself along with his mother in his vehicle to the hospital.
He sustained a single gunshot wound to his left hand and was treated and released.