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Now, investigators believe it was an accident.
Authorities say they arrived shortly after 7 p.m. and quickly determined "there was no further threat to visitors to the mall."
Instead, police think a firearm in a shopper's pants went off unintentionally.
No injuries were reported and authorities are still looking for the culprit.
Anyone with information is asked to call UMTPD at 610-265-3232.
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