A gunman shot multiple people in a New York City office building on Monday before turning the gun on himself.

A lone gunman walked into a skyscraper in midtown Manhattan and injured three people, including a police officer, according to the New York Post. The gunman then took his own life.

It’s unclear how many people have been injured in the chaotic situation. As many as six people may have suffered wounds from the gunman, a law enforcement source told FOX5.

The office building he entered houses Blackstone and the NFL headquarters. New York City police and FBI agents swarmed the area on Monday afternoon amid reports of an active shooter.

The gunman was reportedly found dead by his own hand on the 33rd floor of the office building, according to the Post.

Local and federal officials began posting updates as videos from the response rocketed across social media.

New York City Mayor Eric Adams posted a warning to social media: “New Yorkers: there is an active shooter investigation taking place in Midtown right now. Please take proper safety precautions if you are in vicinity (sic) and do not go outside if you are near Park Avenue and East 51st Street.”

FBI Deputy Director Dan Bongino posted to X that the FBI joined the law enforcement response.

“FBI New York Field Office management personnel and agents are responding to provide support at the active crime scene in Manhattan,” Bongino said.