Eleven passengers and one crew member suffered minor injuries after a Singapore Airlines flight was hit by turbulence on Sunday.

"Flight SQ 308 experienced moderate to severe turbulence en route from Singapore to London," a spokesman confirmed, adding that the aircraft had experienced a sudden loss of altitude. Medical staff treated the 12 injured on the plane's arrival at London's Heathrow Airport.

It is understood that the incident took place about two hours after departure. Seat-belt signs were turned on at the time.

A total of 328 passengers and 26 crew members were on board the Airbus A-380 aircraft.