New surveillance video shows the two men inside United Gas on the 6900 block of Buist Avenue shortly before 10:30 p.m. Tuesday.
The armed men forced their way behind the register and held the employee at gunpoint.
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Police say they took $1,600 in cash, the victim's phone and tobacco products before fleeing on foot.
Anyone with information on the suspects should contact Southwest Detective Division at 215-686-3183/3184.