A helicopter made a crash-landing onto the roof of a midtown Manhattan skyscraper today, killing at least one person and sending a plume of smoke skyward from the top of the building.

The crash occurred shortly before 2pm, local time, on a rainy, foggy day at the 229 metre (750ft) AXA Equitable Center at 787 Seventh Avenue.

Dozens of emergency vehicles swarmed the busy area, a few blocks north of Times Square.

The person killed is "presumed" to be the pilot, New York City Mayor Bill de Blasio said at a news conference.

No injuries, either to people in the building or on the ground, have been reported, he said.

"Thank God for that," Mr de Blasio said. "This could have been a much worse incident."

The mayor said the cause was unknown but that there was no indication that the crash was an "act of terrorism".

It was not clear if the weather was a contributing factor.

Axa Equitable Center New York
The building where the helicopter crashed in midtown Manhattan was shrouded in fog today

The helicopter took off from a heliport on Manhattan's east-side and crash-landed on the building 11 minutes later, emergency officials said.

The site is about half a mile from Trump Tower, where US President Donald Trump maintains an apartment.

The area has been under a temporary flight restriction since his election in November 2016.

Nathan Hutton, who works in information technology for the French bank BNP Paribas on the 29th floor, said the building shook when the helicopter slammed into the roof.

"It felt like you were just standing there, and someone takes their hand and just shoves you," he said. "You felt it through the whole building."

The Federal Aviation Administration said in a statement that the aircraft was an Agusta A109E, a twin-engine, lightweight helicopter.

The pilot was the only person aboard, and FAA air traffic controllers did not handle the flight, according to the agency.

The National Transportation Safety Board will investigate the cause of the crash, the FAA said.

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Melvin Douglas, 50, who was selling umbrellas on the street, said he heard a "rumble" when the helicopter crash landed.

"I didn't see it, but I felt it," said Mr Douglas. "Smoke was on top of the building."

A fire that broke out on the roof was quickly brought under control, the fire department said. The building was evacuated after the crash.

Mr Trump called New York Governor Andrew Cuomo, who was at the scene soon after the crash, to offer assistance if needed, the governor's office said.

The AXA Equitable Center was built in 1985 and includes more than 50 floors. A roof helipad is not listed as one of the building's amenities on its website.

Helicopters are a regular sight in the air around Manhattan, and they have occasionally been involved in crashes.

Nearly a month ago, a helicopter crashed into the Hudson River in New York City shortly after taking off from Manhattan, injuring two people.

A sightseeing helicopter went down in New York City's East River in March 2018, killing five passengers.