Police were called shortly after 8:45 p.m. to the retailer at 12046 E. Washington St. on a report of a person shot and a robbery in progress.
According to CPD, the armed robbery took place on Nov. 19 at the Speedway gas station in the 900 block of North German Church Road.
He was last seen Tuesday, is believed to be in extreme danger and may require medical assistance.
Seth Dunn was found shot in his Cumberland apartment in June of 2015.
The town of Cumberland has issued a boil water advisory for Gem Water customers until further notice.
Two groups of juveniles were apprehended Saturday after one group opened fire on the other outside an elementary school, and a police officer fired a shot.
Officers hope the Cumberland Assertive Response and Engagement Team (CARE) will reduce unecessary arrests and provide mentally ill individuals with appropriate help.
Warren Township School District Police Department Cheif Adrian Pettis showed the pledge to his officers Monday.
Police say they are searching for two suspects caught on video during a robbery at a Speedway convenience store.
An unidentified male entered a Speedway gas station located in the 900 North German Church Road on Oct. 19 and robbed the establishment.