Cops swarmed a Brooklyn subway this week in search of a “man with a gun,” dragging out a screaming couple fresh “off a date” who insisted they did nothing wrong, according to video and police.

The video, posted to Twitter, shows the Monday night confrontation, in which about 10 cops are seen yanking the couple off a No. 2 train at Atlantic Avenue in Downtown Brooklyn around 1 a.m.

Police said they received a 911 call of a man with a gun and identified the man who matched the caller’s description.

Believing he had a gun, the officers attempted to remove him from the subway car — while he and his companion screamed that they had done nothing wrong.

Neely Grobani, who posted footage of part of the scene to Twitter, told The Post she entered the subway with the couple at Times Square-42nd Street. After the subway pulled into Atlantic Avenue, “the doors opened and closed, and instead of taking off for the next stop, cops swarmed outside the car I was in.”

“We all wondered what was going on as about 15 cops stood on one side the closed doors and we all sat on the other,” she wrote in the accompanying tweet. “As soon as the doors opened, the cops rushed in and grabbed the young man I was sitting across from. They grabbed his girlfriend as soon as she tried to follow him to figure out what was going on.”

Grobani’s video shows the man repeatedly asking the officers why they’re pulling him out.

“What did I do? What did I do? I just came off a date,” he’s heard saying as the cops pull him out of the car.

The woman, who is seen struggling with the cops, screams, again and again, “Get off of me — get the f–k off of me!” and “What are you pulling him over for?” before getting handcuffed and dragged onto the platform.

Cops searched the train and the platform and did not find a gun, with Grobani saying, “There was nothing there.” The man and woman were charged with disorderly conduct and released, police said.

The incident is reminiscent of a brawl between teenagers and cops in October at the Jay Street-Metrotech station that escalated after officers allegedly attempted to break up a fight.