Officials said the gunman fatally shot himself after his attack, which set off a chaotic scene that rippled out into the heart of Manhattan during rush hour.

No motive has been announced. A suicide note was found expressing grievances with the NFL and saying Tamura suffered from CTE, a source said. Follow for live updates.

Multiple casualties as gunman opened fire in the lobby of the midtown Manhattan building on Park Avenue that is home to the Blackstone investment firm and other corporations before moving to other floors.

A shooting at a midtown Manhattan office building on Monday left at least five people dead, including an off-duty New York City police officer, sources told The .

Two teams NYPD detectives headed to Las Vegas Tuesday, to execute search warrants at Shane Tamura's home and at a gun store where he legally purchased a revolver on June 12 using a Nevada concealed carry permit,

One of the four victims who was shot and killed by a gunman inside a Midtown Manhattan office building on Monday night has been identified by her employer, Blackstone. Wesley LePatner worked at the global investment firm for more than a decade.

Four people were killed and a fifth was injured in a mass shooting at a Midtown Manhattan office building on Monday.

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.

NYPD officials are heading to Las Vegas to investigate the gunman who killed four people in a Midtown Manhattan skyscraper.

This is a breaking news story. For latest updates, please go to our live blog. An NYPD officer and at least four other victims were killed in a shooting at an office skyscraper in midtown Manhattan Monday evening,

In light of the shooting in New York City on Monday in which a man killed four people, some safety and workplace experts are saying it’s time to consider legislation aimed at protecting office workers. And many are pointing to a recently enacted law in California as an example of what other states might consider.

P olice have identified the man who they say entered a Midtown Manhattan office building wearing body armor and opened fire, killing four people with a high-powered rifle, as Shane Devon Tamura.