Police say a man was using the ATM when the suspect came up behind him and put a gun against his back.
The suspect got some cash from the victim and ran away.
Anyone with information about this case is asked to call investigators at 302-834-2630 ext. 6 or Crime Stoppers at 1-800-TIP-3333.
You can get the latest crime statistics from the Philadelphia Police by CLICKING HERE for the force's crime data mapping site.