Five people, including a New York City police officer, died in a shooting in Manhattan. Suspected gunman Shane Devon Tamura died of a self-inflicted gunshot wound, officials said.

A gunman opened fire inside a high-rise corporate building in the heart of Manhattan on Monday evening, killing a New York City police officer and three other people, officials said. The suspected shooter acted alone and died from a self-inflicted gunshot wound,

He represented the best of New York City, an immigrant from Bangladesh who put on a uniform to protect and serve us all,” the mayor said.

NYPD Commissioner Jessica Tisch laid out a timeline of how Shane Tamura carried out his heinous attack on a Midtown skyscraper early Monday evening.

The alleged gunman at a shooting rampage in a Midtown Manhattan office building was identified as 27-year-old Shane Tamura, of Nevada.

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In the photos first shared online, Tamura was captured walking into 345 Park Avenue with an assault rifle in his hand while decked out in a suit.

New York City mayoral candidate Zohran Mamdani responded on Monday after a gunman opened fire in a midtown Manhattan office building that houses the National Football League ( NFL) and some of the country's top financial firms.

The 27-year-old suspected gunman left a note at the scene voicing anger that his mental illness may be linked to his having played football, officials familiar with the investigation told NBC News.