PHILADELPHIA (CBS) – Police are on the hunt for a suspect who is accused of using threatening demand notes to rob a Dunkin’ Donuts, Burger King and McDonald’s in Northeast Philadelphia.

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Police say the first incident occurred on December 14, 2014. A 19-year-old male was working at the Dunkin’ Donuts on the 5900 block of Rising Sun Avenue when an unknown male entered the store and handed him a demand note that read, “Empty the register or you’ll get shot.”

Authorities say the employee gave the suspect an undetermined amount of cash and the suspect fled the scene.

The second incident occurred on January 4 just after 1:30 p.m. Police say an unknown male acting as a customer entered the Burger King on the 5800 block of Castor Avenue and handed the female employee a demand note. Authorities say after the suspect showed a handgun, the worker placed money from her cash drawer in a plastic bag. The suspect then fled the scene in an unknown direction.

The latest incident occurred on January 20 at 7 p.m. A 20-year-old woman was working behind the counter of the McDonald’s at 5498 Oxford Avenue when an unknown male entered and approached the counter handing her a demand note. Police say again the suspect displayed handgun, but a customer entered the store and stood behind him.

Authorities say it was failed attempted of obtaining money and the suspect left the scene.

Police describe the suspect as a Black male around 40-years-old, 5’8”-6’0”, with possible scars on his face. He was wearing a black jacket, black hat and glasses.

Authorities ask anyone with information to call 215-686-TIPS (8477) or text a tip to PPD TIP or 773847.