Officers were called to the Francis Myers Rec Center in Southwest Philadelphia just after 8 p.m. for reports of shots fired.
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The center is located at 59th Street and Kingsessing Avenue.
Police at the scene found shell casings but did not locate a victim.
If you know anything about this shooting, there could be a reward in your future.
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Since last year, the city has offered $10,000 for information that leads to the arrest and conviction of someone who fires a weapon within 500 feet of a school, rec center or library.
RELATED: Check the 6abc Neighborhood Safety Tracker