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Passengers have described the horror onboard a Boeing 787 flight that dropped mid-air leaving at least 50 people injured, one seriously.

The flight by LATAM Airlines dropped abruptly mid-flight from Sydney to Auckland on Monday with people being thrown from their seats and hitting the roof of the plane.

According to the airline and a New Zealand health service organisation that treated the injured the aircraft experienced a strong shake and as a result 10 passengers and three cabin crew members were taken to a hospital. The South American carrier said as it investigates the cause.

The flight with 263 passengers and nine cabin crew members landed at Auckland airport as scheduled on Monday afternoon.

One person is in a serious condition while the rest suffered mild-to-moderate injuries, a spokesperson for Hato Hone St John, which treated roughly 50 people at the airport, said. “The plane, unannounced, just dropped. I mean it dropped unlike anything I’ve ever experienced on any kind of minor turbulence, and people were thrown out of their seats, hit the top of the roof of the plane, throwing down the aisles,” passenger Brian Jokat told the BBC.

The cause of the apparent sudden change in trajectory of flight LA800 could not be ascertained immediately. Safety experts say most airplane accidents are caused by a cocktail of factors that need to be thoroughly investigated.

“Some of the roof panels were broken from people being thrown up and knocking through the plastic roof panels in the aisle ways. And there was blood coming from several people’s heads.” Jokat, who was not injured in the incident, said.

He said passengers who were doctors on the plane provided bandages and neck braces for people who were severely injured.

The eight-year-old Boeing 787-9 Dreamliner, according to flight tracking website FlightRadar24, was on its way to Santiago via Auckland.

LATAM Airlines said a new flight to Chile will depart from Auckland on Tuesday.

Boeing shares were down about 4% in US morning trading.

In 2008, dozens of people were injured when another wide-body jet, an Airbus 330 operated by Qantas Airways, dropped sharply because of faulty readings from a flight data computer while heading for Perth in Australia.

Boeing said it was working to gather more information and will provide any support to the airline. The U.S. Federal Aviation Administration and the National Safety Board did not immediately respond to requests for comments.

Separately, the Wall Street Journal reported on Saturday the US Department of Justice has opened a criminal investigation into 737 MAX mid-air cabin-panel blowout on an Alaska Airlines flight in January.

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