A United Airlines flight from Africa to Washington D.C. had to turn around on Thursday after a "technical issue" caused "unexpected aircraft movement," the airline 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.”

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.

Four passengers and two crew members sustained serious injuries, while 27 passengers and five crew members suffered minor injuries.

Thirty-eight people were injured, including six hospitalized, after a United Airlines flight from Lagos to Washington, D.C., encountered midair difficulties, Nigerian officials

Six people were seriously injured when a United Airlines flight experienced sharp drops in speed during its journey to Washington Dulles International Airport.

A United Airlines flight between Nigeria and the US experienced sudden, unexpected movement inflight, injuring 38 people

Six were injured on a United Airlines flight from Lagos to Washington after the plane had a technical issue that caused an "unexpected movement."

A United Airlines flight had to make an emergency landing in Lagos, Nigeria due to a midair incident causing loss of pressure and sharp descents.

A United Airlines flight from Nigeria was forced to make an emergency landing after six people were injured following an unexpected mid-air jolt.