One police officer and three civilians were murdered by a gunman in Midtown Manhattan, New York, on Monday evening.

The scene is “contained”, and the “lone shooter has been neutralized,” NYPD commissioner Jessica Tisch said on X.

The slain officer was identified as Didarul Islam, 36, a Bangladeshi immigrant who had served as a police officer in New York City for 3 1/2 years, police Commissioner Tisch said at a news conference.

Police identified the gunman as Shane Tamura, of Las Vegas. According to the Commissioner, he had a ‘documented mental health history,’ but the motive is still unknown, Tisch said. The gunman died of a self-inflicted gunshot wound.

The shooting took place at 345 Park Avenue. The building hosts the headquarters of investment firm Blackstone as well as the headquarters of the NFL. “We are working to understand why he targeted this particular location,” Tisch stated.

New York City Mayor Eric Adams said that one man was seriously injured and remains in critical condition. Four others got minor injuries attempting to flee the scene.

"New Yorkers: there is an active shooter investigation taking place in Midtown right now," Adams wrote in a post on X during the incident. "Please take proper safety precautions if you are in the vicinity and do not go outside if you are near Park Avenue and East 51st Street."

Gov. Kathy Hochul said on X she had been briefed on the shooting and urged people to avoid the area.

FBI agents responded to the shooting, its deputy director, Dan Bongino, said on X.

"FBI New York Field Office management personnel and agents are responding to provide support at the active crime scene in Manhattan," he wrote.