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.”

A United Airlines flight en route to Washington made an emergency return landing in Lagos due to a technical issue, leaving six people seriously injured.

A United Airlines flight from Nigeria to the US was forced to make an emergency landing in Lagos early Friday. The flight from Lagos to Washington D.C. turned back after the aircraft — a Boeing 787-8 — experienced a technical issue and "an unexpected aircraft movement,

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

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

Six people, four passengers and two crewmembers, were injured on a United Airlines flight Friday from Lagos, Nigeria, to Washington Dulles International Airport in Virginia, according to the airline.

United Airlines Flight 613 traveling from Lagos, Nigeria, to Washington D.C. returned to Lagos after there was “unexpected aircraft movement” early in the morning of Friday, Jan. 24, USA Today Travel and CNN reported.