Six people including three children were killed after a sightseeing helicopter crashed into the Hudson River in New York on Thursday, sparking a major water rescue operation, authorities said.

The crash killed all those onboard the aircraft: the pilot and a family from Spain. Two of the victims were initially taken to a hospital, but later succumbed to their injuries.

"At this time, all six victims have been removed from the water. And sadly, all six victims have been pronounced deceased," Mayor Eric Adams told a briefing, after earlier calling it a "heartbreaking and tragic crash."

Officials have yet to release the identities of the victims, but widespread US media reports identified one of the people aboard the helicopter as Agustin Escobar, a Spanish executive at global technology company Siemens.

The chopper`s landing skids were seen protruding from the river beside a tunnel vent as several boats clustered around the impact site.

Police from both New York and New Jersey, which is on the opposite side of the river from Manhattan, responded to the scene along with fire department vessels.

The NBC4 channel reported that its own helicopter was unable to take off because of weather conditions, with the weather in New York on Thursday gusty under thick cloud cover.

A witness told AFP it appeared like the helicopter`s rotor blade "shattered in the sky."

"And after it shattered, then we saw the helicopter just spiral... And then it just crashed into the water just like that," said fashion designer Belle Angel.

The Federal Aviation Administration said in a statement it was Bell 206 helicopter.

"The FAA and the National Transportation Safety Board will investigate," it added.

President Donald Trump took to social media to call the crash "terrible."

"The footage of the accident is horrendous. God bless the families and friends of the victims," he wrote on Truth Social.

`Heartbreaking`

The river is a busy shipping channel and the scene of a dramatic 2009 incident when a US Airways jet safely landed in the water. All 155 people on board escaped alive in an event dubbed "Miracle on the Hudson."

The river is as deep as 200 feet (60 meters) at points, and an AFP correspondent saw what appeared to be floatation devices deployed on the helicopter`s skids.

The average temperature of the river is 46 degrees Fahrenheit (8 degrees Celsius) at this time of year, according to the US Geological Survey.

"Three adults and three children were on board a Bell 206 helicopter that had left from the downtown Skyport at just about 3 pm," Adams said, adding that the tourists were a family from Spain.

Police and fire service (FDNY) divers raced to pull survivors from the wreckage, he said.

"NYPD divers pulled four people from the crash site, and FDNY Divers recovered an additional two. Immediate lifesaving measures were undertaken on the vessels at the scene, as well as the adjoining pier," police commissioner Jessica Tisch said.

"Four victims were pronounced dead on scene, and two more were removed to local area hospitals, where, sadly, both succumbed to their injuries."

The chopper took off around 3 pm, flying south before heading up the Manhattan shoreline to the George Washington Bridge, turning back towards the downtown Manhattan heliport, losing control and hitting the water near a Hoboken pier, Tisch said.

The police commissioner said the aircraft was operated by New York Helicopter, which did not respond to a request for comment but lists the Bell 206 among its fleet.

There have been around 30 helicopter crashes in New York since 1980, Brooklyn Borough President Mark Levine told reporters, calling for tighter restrictions on helicopter traffic in the city.

Source: AFP