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The gunman, armed with an assault rifle, walked into the lobby and killed a police officer and two others. He killed another person on the 33rd floor before turning his gun on himself.

By Ed ShanahanChelsia Rose Marcius and Maria Cramer

A gunman armed with an assault-style rifle walked into a Midtown Manhattan skyscraper on Monday evening and began firing, killing a New York City police officer, fatally shooting three other people and critically wounding a fifth before killing himself, officials said.

Three of the four people killed were shot in the building’s lobby as the gunman sprayed the area with bullets, Jessica Tisch, the police commissioner, said at a news conference. The fourth was killed on an upper floor after the gunman took the elevator there, Ms. Tisch said. He then shot himself in the chest, she said.