NYC shooting victims Didarul Islam, Wesley LePatner, Aland Etienne, and Julia Hyman were killed by a gunman inside Manhattan's 345 Park Ave.

The alleged gunman at a shooting rampage in a midtown Manhattan office building was identified as 27-year-old Shane Tamura, of Nevada.

A police officer and a Blackstone employee were among those killed Monday during a shooting at a New York City high-rise. An NFL employee was seriously hurt.

Businesses around the country are reevaluating security after a brazen shooting at a New York City office building raised questions about what it takes to keep workplaces safe. The attack on a seemingly secure building — in a gilded part of Manhattan where the rich live in sprawling apartments and tourists window-shop designer

The gunman who killed four people at an office building in New York City on Monday evening left his home in Las Vegas, Nevada late last week.

The head of the New York Police Department said that investigators plan to question a man who supplied parts for a gun used in the attack on Monday.