Police said the first robbery happened Oct. 1 shortly before 4 a.m. The second was just before 3:30 a.m. Nov. 4, and the third happened Thursday about 3:30 a.m.
In surveillance video released yesterday of the robberies, the bandit is seen walking into the store and waving a gun as he approaches the register.
He's described as 5-feet-8 to 6-feet-2 and wore a "Scream" or skeleton mask, work boots, a dark-colored jacket and jeans during each robbery. In the first, a second man with his face partially covered acted as an accomplice.
Bachmayer said police want to stop the robber before he becomes violent and asked that people take a close look at the surveillance video to see if they recognize the man's clothing. In the second robbery, Bachmayer said, the thug bumped the cashier on top of the head when it took too long to obtain the cash, saying, "Hurry up. You know what's going on here."
"He's dangerous, not only to the public, but also to Wawa employees," Bachmayer said.
Surveillance outside the store showed the robber leave on foot westbound on Hellerman Street from Bustleton Avenue.
Wawa is offering a $5,000 reward for the arrest and conviction of the masked bandit. Police declined to say how much money he has taken.
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