The Nigerian Airspace Management Agency (NAMA) has explained why United Airlines chose to make an air return to Nigeria.

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.

Nigerian Airspace Management Agency, NAMA, has said contrary to reports, United Airlines flight UAL 613, which departed Lagos en route Washington with 256 passengers and 11 crew members on January 24,

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

The same United Airlines aircraft had a similar issue earlier this week, with a rapid altitude drop prompting a diversion.

In an update, Nigerian officials said an additional 27 passengers and 5 crew members suffered minor injuries in the incident. In all, 38 were hurt.

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

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

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

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