United Airlines said it was cooperating with U.S. and Nigerian investigators to determine what exactly happened on the flight.

Nearly 40 people were injured when a Boeing 787-800 plane suddenly lost altitude during a United Airlines flight from Lagos, Nigeria, to Washington, D.C., early Friday, officials said.

Six people were taken to hospital with injuries but have been discharged, United Airlines said.

It is unclear what caused the jolt; United Airlines has said the cause was not severe turbulence, and that it is “working with aviation authorities in the US and Nigeria to understand the cause.”

Nearly 40 people were injured, with six seriously injured, when a Boeing aircraft operated by United Airlines suddenly plunged in mid-air, forcing the fight to make an emergency landing.

A flight to Washington, D.C., returned to Nigeria after “unexpected aircraft movement” caused injuries, United Airlines said. A statement from United emailed to The Hill on Monday said that one of

The plane headed back to Nigeria after experiencing "unexpected movement" mid-flight on Friday, Jan. 24, according to multiple reports

Six people were injured on a flight from Nigeria to Virginia. The airline also saw a series technical issues in March.

A United Airlines flight to Washington DC was forced to make an emergency landing after the Boeing plane abruptly plunged in midair, hurting nearly 40 people on-board, including six hospitalised with serious injuries,

A United Airlines flight from Nigeria to Washington experienced a sudden jolt, dropping 185 feet and injuring six people seriously. United said it was a "technical issue". U.S. and Nigerian authorities are investigating.

The U.S. National Transportation Safety Board (NTSB) is investigating a United Airlines flight incident that led to passenger and crew injuries following a sudden aircraft movement. The flight, en route from Lagos to Washington D.