Investigators released surveillance video of the incident on Friday. It happened at the Wawa along West Dekalb Pike in King of Prussia.
The video shows a blue minivan pulling up next to the victim. The suspect walks up and demands the victim's cell phone.
The suspect then punched the victim in the face, then continued to beat him even after he fell to the ground.
The attacker is described as a white male with a thin build. Police say the suspect was riding in a light blue Dodge Caravan or Chrysler Town and Country.
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