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, law enforcement officials told NBC News.

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.