A New York City police officer and three other people were shot and killed in Midtown Manhattan office building on Monday evening, police confirmed.
The suspect, identified as Shane D. Tamura, 27, of Nevada, died of a self-inflicted gunshot wound, police said.
Fallen Officer Didarul Islam, 36, worked out of the 47th Precinct in the Bronx. He was a four-year veteran of the force, and leaves behind a pregnant wife and two young sons, Mayor Eric Adams said at a late-night news conference.
“He was doing what he does best, and all members of the police department carry out. He was saving lives. He was protecting New Yorkers,” Adams said. “He was an immigrant from Bangladesh and he loved this city. And everyone we spoke with stated he was a person of faith and a person that believed in God and believed in living out the life of a godly person. He embodies what this city is all about. He’s a true-blue New Yorker, not only in a uniform he wore but in his spirit and energy of loving this city.”
Adams said two men and a woman were also killed in the shooting. Another man is in critical condition. The mayor called the shooting “a violent, despicable attack.”
Adams said he met with Officer Islam’s family earlier in the evening and told them how much he was admired for putting his life on the line.
“This was his dad’s only son. I think about Jordan, my child, and it is unimaginable to experience a loss of this magnitude,” the mayor said.
Police said the shooter walked into the 44-story building at 345 Park Ave. just before 6:40 p.m., carrying an AR-style weapon by his side and went to the 33rd floor and opened fire. The officers that were shot were acting in a security capacity at the time, working for Rudin Management.
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The building, which contains offices for Blackstone, the NFL and KPMG, among others, was placed on lockdown and was being evacuated and the area was blocked off, CBS News New York has learned.
The NYPD and Mayor Adams asked the public to avoid the vicinity of East 52nd Street between Park Avenue and Lexington Avenue.
“Those who are in the building, we’re asking you to remain inside as police officers are doing a floor-by-floor search. We believe, again, the perpetrator is neutralized at this time,” Adams said in a video on social media.
CBS News New York 
CBS News New York’s Jennifer Bisram described a massive police presence at the scene, including New York State Police and SWAT team members.
The NYPD said 50th to 53rd streets between Lexington and Park were closed, and the MTA said E and M trains were bypassing stations in the area.
Please stay with CBS News New York for more on this developing story.
contributed to this report.