Surveillance video of the suspect has been released, and authorities are hoping the public can help identify and locate him.
There have been three robberies with three different women targeted and one attacked.
The suspect was caught on video while exiting the A train station at 127th Street and St. Nicholas Avenue after the first incident on August 7. Police say the suspect went after a 37-year-old woman around 7:30 p.m. Armed with a knife, he stole her purse and fled into the street.
According to police, he did the same thing at the A train stop at Broadway and Dyckman Street on August 27 at 3 a.m. The victim in that case was a 28-year-old woman.
The most recent incident happened Sunday at the No. 2 train stop at 96th Street and Broadway at 2:30 a.m. Police say the 27-year-old victim refused to give up her bag and fought back. During a struggle, she was stabbed in the left side of her torso. Then he grabbed her purse and ran.
The suspect is described as black male in his late 20s, approximately 6-foot tall and weighing 175 pounds. Anyone with information is asked to call police.