Helicopter crashes onto Manhattan, New York building

A helicopter has crashed onto the top of a building in Manhattan, New York, sparking a major emergency response.

One person, the pilot, was killed in the crash, the New York Times reports.

The helicopter crashed on top of a 54-storey building in midtown Manhattan, a number of blocks from Times Square.

At least one building has been evacuated and New York Governor Andrew Cuomo says there is no reason to believe the crash is suspicious or could have been related to terrorism.

"The only indication was a helicopter had to do an emergency or a hard landing or crashed on to the roof top of the building, causing a fire."

Onlookers shared video of emergency responders swarming the area.  

Us President Donald Trump said in a tweet he has been briefed on the situation and the administration is ready to provide assistance.

"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."

Witness Morgan Ares told CNN the building he works in was evacuated due to the crash.

"It was a little nerve-wracking in the stairwell because nobody knew what was going on but we did feel the tremors so that's what made it a little more surreal."