Four people were killed, including an off-duty New York City police officer, when a gunman opened fire in an office tower before fatally shooting himself, officials said.

A note written by the shooting suspect was found at the midtown Manhattan office building scene where he killed four people, including an NYPD officer, and himself a day ago, officials familiar with the investigation said overnight.

Multiple people were killed in a shooting Monday in a corporate office building in Midtown Manhattan, according to media reports. The New York Police Department posted on X that the scene “has been contained and the lone shooter is dead.”

Work was winding down at 345 Park Avenue on Monday when a man strode across the public plaza just outside the Midtown Manhattan tower with an assault rifle in his hand.Within minutes, at least four people were dead,