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Update (1930ET): It is being reported that the shooter has been found dead on the 33rd floor of the building. He died from a self-inflicted gun shot wound.

An active shooter has been reported at 345 Park Avenue, the site of Blackstone's headquarters as well as some offices belonging to the National Football League, an NYPD senior official told Bloomberg News.

According to social media report, the perpetrator is a a Middle Eastern man with a bulletproof vest is "running around with a A.R. 15 and shooting."