PHILADELPHIA (CBS)– Philadelphia police and the FBI are asking for the public’s help with finding two men behind a string of bank robberies in the area over the past few weeks.

The most recent robbery happened Monday at a TD Bank branch on East Butler Street.

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Police say the suspects entered the bank around 2 p.m. and demanded cash at gunpoint before leaving.

Authorities believe the same two men are responsible for two bank robberies on December 17th in Philadelphia, and a third in Upper Darby Township on December 23rd.

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The first suspect is described as a black man in his early to mid-30s, approximately 5’10”-5’11” tall, medium complexion. He was wearing a dark gray hooded sweatshirt, black scarf or mask concealing the lower part of his face, black knit cap, and black pants. He carried a compact black semi-automatic handgun.

The second suspect is described as a black man in his late 20s to early 30s, approximately 5’9″-5’11” tall, light complexion. He had on a light gray hooded sweatshirt with the hood up, a black scarf or mask concealing the lower part of his face, black gloves, and black pants.

These men are considered armed and dangerous.

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Anyone with information about these robberies or these subjects is urged to call the FBI at 215-418-4000 or the Philadelphia Police Department.