The incident occurred just before 3 a.m. at the store on the 4700 block of Mascher Street.
The police are questioning an employee, and have not said what was taken.
Police have not said if this is connected to a recent string of 7-Eleven robberies.
Four stores have been robbed since August 20th in Philadelphia and Bensalem Township.
In all the robberies, the suspect threatened the employees and showed a gun.
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