An AirAsia plane en route from Indonesia to Singapore with 162 people on board has lost contact with air traffic control.
Flight QZ8501 went missing at 07:24 (23:24 GMT), tweeted the Malaysia-based airline.
Indonesian military planes are searching an area of the Java Sea after the flight disappeared about two hours into a three-hour flight.
The pilot had called for a 'deviation' from the flight path due to bad weather.
The Foreign Office has confirmed that a British national was on board and said the next of kin has been informed.
AirAsia said there were 155 passengers on board, with 138 adults, 16 children and 1 infant. Also on board were 2 pilots and 5 cabin crew.
Most passengers were from Indonesia but there were also passengers from South Korea, Singapore, Malaysia and France on board.
A statement said: "AirAsia Indonesia regrets to confirm that flight QZ8501 from Surabaya to Singapore has lost contact with air traffic control at 07:24hrs this morning.