India, July 29 -- A shooter wearing a bulletproof vest opened fire inside a Midtown skyscraper that houses Blackstone and NFL headquarters Monday, July 28. Three people were shot, including a cop who died, before the gunman turned the gun on himself, the New York Post reported.

The NYPD responded to calls about an active shooter at 324 Park Avenue, and found the gunman dead from a gun-inflicted gunshot wound on the 33rd floor.

The gunman entered the building carrying a rifle, which can be seen in a photo that has surfaced. He then opened fire, shooting at least one cop, who was killed. Two civilians were shot too, and one of them is now in critical condition.

The chilling photo shows the suspect calmly walking across the Park Ave. skys...