According to the police sources, a helicopter crashed on the roof top of a high-rise building in midtown Manhattan.
The pilot of the helicopter, who has lost his life, has been identified as Tim McCormack.
The pilot's family has been informed, CNN quoted a source as saying.
Authorities also ruled out a connection of a terror angle with the crash.
According to the police, that the Agusta A109E helicopter took off from the 34th heliport at around 1:32 pm (local time) and crash-landed on the roof of the 54-storey building at 787 Seventh Avenue after being airborne for 11 minutes.
De Blasio remarked that “there was no indication that the crash was an act of terror” while Cuomo said that people who were in the building said they felt the “building shake.”
The New York Fire Department (FDNY) said that fire officials rushed to the spot as soon as they got the news of the crash. The rooftop blaze was doused within half an hour.
“FDNY members made their way to the roof and we were able to put water on the fire quickly. The fire has been extinguished, and the fuel leak has been mitigated,” FDNY Commissioner Daniel A. Nigro told reporters.
"I have been briefed on the helicopter crash in New York City. Phenomenal job by our GREAT First Responders who are currently on the scene. THANK YOU for all you do 24/7/365! The Trump Administration stands ready should you need anything at all," US President Donald Trump tweeted.