A civilian Eurocopter AS350 helicopter carrying six people went down in the East River in New York City on Sunday night. Only the pilot survived.

The helicopter belonged to Liberty Helicopters, a company based in New York City that specializes in aerial tours and contracting for photography. According to a press statement, the five passengers that died on Sunday night were a part of a privately chartered flight for a photography project.

According to a report by the Federal Aviation Administration, the crash took place just after 7 p.m. local time. The pilot, 33-year-old Richard Vance, called out over the radio that the helicopter was experiencing engine failure just before it went down into the river. Although the pilot appeared to manage the landing fairly well, the helicopter soon toppled over and capsized, leaving the pilot and five passengers secured to their seats and submerged under water.

The pilot was able to cut himself free from his seat-restraints and make it to the surface to be rescued. None of the passengers, however, were so lucky.

One of the most difficult parts of the rescue were that five people were tightly harnessed,” Fire Department of New York Commissioner Daniel Nigro said. “People had to be cut out.”

Liberty Helicopters describes itself on its website as “the largest and most experienced helicopter sightseeing and charter service in New York City,” and boasts “a fleet of 10 state-of-the-art Airbus helicopters (formerly American Eurocopter).” Reviews of the business online have, by and large, been positive, but following the tragic death of five passengers that likely survived the crash, only to perish due to their restraints, some have raised questions about the business’s safety record.

“We have been in business and flying safely for over 30 years,” the website says, though it makes no mention two previous crashes in just over ten years. In August of 2009, investigators faulted a Liberty Helicopter pilot for a head on collision with a private plane over the Hudson River. The FAA determined that the helicopter, with nine passengers on board, should have been maintaining a lower altitude to avoid the crash.

Two years prior, another incident over the Hudson saw a Liberty Helicopter with eight people on board plunge into the river. One of those passengers happened to be an off-duty paramedic, who was credited with helping to get everyone off of the helicopter safely.