Winter
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, a Blackstone executive and two other people, officials said.
The suspected shooter acted alone and died from a self-inflicted gunshot wound, law enforcement officials told NBC News.
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Police officers and emergency vehicles respond to a shooting in midtown Manhattan on Monday.John Lamparski / AFP via Getty Images
The deadly gunfire, which was first reported about 6:3
