Police are searching for a man who was captured on surveillance video violently attacking a woman on the subway in Brooklyn last month.

The video shows the suspect following the 56-year-old victim down the stairs at the 18th Avenue F train station in Borough Park at about 2:40 a.m. March 9. He punches her repeatedly and eventually throws her to the ground. 

The suspect empties the woman's purse as she lies on the ground, and then when she tries to escape, he chases after her. He finally runs off.

It's not clear if he first targeted the woman at the station or on the train. Subway riders in the neighborhood were rattled when they saw the brutal attack video. 

"It gives you nightmares. That's awful," said Claudia Trapp of Borough Park, who says fear of such violent robberies keep her from riding the subway late at night.

Police are still looking for the suspect, who can be seen in the video wearing a hoodie sweatshirt with "Alpha Phi Delta" on the front, and "Stugotz" and the number 27 on the back. 

The woman sustained minor injuries.