Live updates and developments about a shooting in New York City's Midtown. Six people, including the gunman and a police officer, are dead.

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.

Mamdani wrote on X that he was "heartbroken" by an active shooting in Manhattan that left at least three people dead.

The boy is charged with first-degree murder, attempted first-degree murder and aggravated discharge of a firearm. He is accused of fatally shooting Derik Johnson,18, and wounding a 15-year-old boy July 23 in the 7200 block of South Avers Avenue.

Retired Las Vegas police lieutenant Randy Sutton discusses how the alleged gunman involved in the New York City shooting may have a connection to Las Vegas on ‘Jesse Watters Primetime.’

At least three people were killed and three others were injured by a gunman at the Grand Sierra Resort casino in Reno, Nevada, on Monday, authorities said.

The shooter, not in custody, opened fire late Sunday in the 700 block of South Springfield Avenue after losing a fight with one of the victims, according to police.