Surveillance video from inside the 7-Eleven on the 3200 block of Byberry Road, at 3 a.m. on March 9.
The masked gunman demanded money from the worker and took off in a Nissan.
Police say five minutes earlier, the same man tried and failed to rob a Sunoco station on Woodhaven Road.
Several minutes after robbing the 7-Eleven, the gunman broke into Saint Anselm's Church, half a mile away, and stole a donation box.
If you have any information on the string of thefts, contact Northeast Detectives.
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