A small part of the nation’s largest city has drawn people bent on killing to draw attention to their causes. The man who shot four people at a Park Avenue office tower was the latest.

The gunman was dead, the police said, and the building was in lockdown Monday evening.

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

The gunman opened fire Monday in a Park Avenue tower that has offices of the National Football League and the investment firm Blackstone, before killing himself. The N.F.L.’s…

The gunman killed four people, including a police officer, in a Park Avenue tower. A note found in his wallet accused the league, which has offices in the building, of downplaying…

A small part of the nation’s largest city has drawn people bent on killing to draw attention to their causes. The man who shot four people at a Park Avenue office tower was the…