By Whitney Burbank, WBZ-TV

BOSTON (CBS) — Police are looking for a man they say attacked and robbed a woman in the Haymarket MBTA station.

January 6, around 11 p.m., a man attacked a woman walking through the underpass from the Green Line to the Orange Line at the Haymarket MBTA Station.

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WBZ NewsRadio 1030’s Bernice Corpuz reports

Surveillance video shows the suspect as he comes from around a corner, pushes the woman into a wall, and knocks her to the ground. Police said he threatened the victim with a gun.

He allegedly took two dollars from the woman before being chased off by another man.

“Although the amount of property taken was small the type of crime, a violent crime with a threat of a gun, we’re very concerned,” said MBTA Superintendent Joseph O’connor. We want to identify the individual and get him into the court system.”

Although the incident was captured on camera, the suspect’s dark, puffy coat and hood has made him tough to track down.

O’Connor said they’re hoping eyewitnesses will come forward with more information on the case. O’Connor hopes to hear from the man who chased after the suspect and a separate woman who was seen talking to the suspect before the robbery.

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Police say they could have clues that may help identify the suspect

According to O’Connor, a man seen by the ticketing area is a person of interest. O’Connor would not say how this man was involved in the robbery.

O’Connor said this kind of crime is an abnormal occurrence for the Haymarket station.

“This is the first time I’ve ever heard something like that,” said college student Glenda Ramirez. “It makes me wonder, like what if that happens to me one day because we always take the train to school. If it happens to a women like that it could happen to us easily as well.”

MBTA rider Paul Burdette was shocked to learn of the robbery.

“I hope (the witnesses) do come forward with information about the supect and he gets caught in time.”

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If you recognize the people in the video call the Transit Police Criminal Investigations Unit at 617-222-1050 or anonymously via our text a tip line at 873873.