The deadly Park Avenue shooting happened at one of the the most exclusive addresses in Midtown Manhattan — the “Blackstone Building," which is home to financial giant Blackstone, the NFL and accounting firm KPMG among a slew of other corporate names.

NEW YORK -- A 27-year-old man wearing body armor and carrying an M4 assault rifle shot and killed four people, including off-duty New York Police Department Officer Didarul Islam, who was working security in a Midtown Manhattan office building, officials said during a press conference Monday evening.

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Monday's shooting was at 345 Park Ave., which houses the NFL's headquarters. ByAaron Katersky, Mark Crudele, Tonya Simpson, and Josh Margolin The 27-year-old man who allegedly shot and killed four people at a Midtown office building on Monday carried a note in his pocket claiming he suffered from CTE and asking that his brain be studied,

Shooter Shane D Tamura killed an NYPD officer, injured a civilian, and died by suicide on the 33rd floor of 345 Park Ave, home to major NYC offices.

At least one police officer and two civilians were injured in a shooting in the 634-foot Manhattan skyscraper that houses NFL HQ on Monday evening.

The 27-year-old Nevada man opened fire at a New York City office building, killing at least four people and then himself.

A police officer and three other people were killed after a gunman opened fire Monday evening at a Midtown Manhattan office building that houses The Blackstone Group and NFL headquarters, police

New York City police converged on a Park Avenue skyscraper in midtown Manhattan where gunshots were reported fired on Monday inside the tower housing offices of several financial firms and the headquarters of the National Football League,