At least one dead after 'severe turbulence' hits flight from London to Singapore

At least one person died and several more were injured when a plane was hit by “severe turbulence,” Singapore Airlines said in a statement Tuesday.

The London to Singapore flight was diverted to Thailand's capital, Bangkok, landing there at 3:45 p.m. local time (4:45 a.m. ET), said the statement published on Facebook. “We can confirm that there are injuries and one fatality on board the Boeing 777-300ER,” the statement added.

The company said in a later statement that 30 people required hospital treatment. Other passengers with more minor injuries were treated at the airport, it said.

Kittipong Kittikachorn, general manager of Bangkok's Suvarnabhumi Airport, said Tuesday that the deceased was 73 years old.

Without saying whether they were a man or a woman, he said the person had some medical problems that could have led to a fatal cardiac arrest.

At least seven people were critically injured, he added at a news conference.

Kittachorn said that an investigation would be carried out, but that the cause of the turbulence "was definitely air pockets."

Singapore Airlines offered its “deepest condolences to the family of the deceased” and said that it was working with Thai authorities to “provide the necessary medical assistance,” while also sending the company’s own team to Bangkok to assist.

After setting off at 10:38 p.m. London time (5:38 p.m. ET) Monday, the plane's journey appeared to be uneventful, according to flight-tracking site FlightAware.

But about 10 hours in, the plane experienced a sharp drop from a cruising altitude of 37,000 feet to 31,000 feet in just five minutes, the FlightAware data said. In one sudden lurch, it dropped almost 700 feet.

Less than 10 minutes later, the plane began its descent into Bangkok.

This article was originally published on NBCNews.com