The family of five killed in a helicopter crash in the Hudson River outside New York City this week had been celebrating a birthday before the tragedy, officials said.

Agustin Escobar, the president of the Spanish branch of the technology company Siemens, his wife, Merce Camprubi Montal, and their three young children were confirmed to be the victims of the crash.

The tragedy occurred on the New Jersey side of the Hudson around 3:15 p.m. local time on Thursday, April 10, shortly after the helicopter took off from downtown New York.

The pilot, who was also killed, has not yet been identified.

The cause of the crash remains under investigation, though witnesses said they saw the chopper — operated by a touring company — “falling apart” in midair and the pilot had reportedly warned he needed fuel before crashing.

The family had traveled from Barcelona, Spain, ABC News reported.

The mayor of Jersey City, N.J., Steven Fulop, wrote on X that Escobar was in the U.S. on business and his “family flew out to extend the trip a couple days in NYC.”

“They were celebrating the mom’s 40th bday with the tourist helicopter flight yesterday,” Fulop wrote on Friday, April 11.

He added that officials were “working … to expedite release of the family to fly back to Spain” and that relatives were en route to the U.S.

The three kids were all 11 or younger, Fulop wrote.

New York City Mayor Eric Adams said that one of the children was set to turn 8 the day after the crash.

“So this is probably part of the normal tourist attraction of seeing the city from the skyline,” Adams told WNYW. “But it’s just a real unfortunate situation. And our heart goes out to the family members.”

The Federal Aviation Administration, which is investigating alongside the National Transportation Safety Board, said the aircraft was a Bell 206 helicopter.

“We are deeply saddened by the loss of our colleague and friend, Agustin Escobar, and his beloved family,” Siemens CEO Roland Busch wrote on X. “Agustin was the CEO of Rail Infrastructure at Siemens Mobility. Our thoughts and deepest sympathies are with Agustin’s family, friends, and colleagues during this difficult time. We will miss him and his family immensely.”

Helicopter crash.

LOKMAN VURAL ELIBOL/ANADOLU VIA GETTY

The aircraft was flying for tour company New York Helicopters, authorities have said.

It “lost control and hit the water just a few feet off the coast of Pier A Park in Hoboken,” New York Police Commissioner Jessica Tisch told reporters.

New York Helicopter Tours CEO Michael Roth said he was “devastated” following the incident, according to the New York Post.