The incident happened around 7 p.m. at the Exxon Station on the 4200 block of Whitaker Avenue.
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Police say four armed masked men were casing the station.
There were gambling machines reportedly located inside the business.
As an employee began taking money out of a safe, the robbers struck, officials say.
The robbers reportedly took about $25,000.
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There are no reports of any injuries at this time.
Anyone with any information is asked to call police at 215-686-TIPS.