Search teams looking for traces of a missing Malaysia Airlines flight have spotted two large oil slicks in the sea off Vietnam.

The Boeing 777 was travelling from Kuala Lumpur to Beijing when it disappeared from radar screens with 239 passengers and crew on board.

It's thought most of the passengers were from China, with three people also confirmed to be from the US.

There was no prior warning from the crew about any technical problems.

Aviation analyst Chris Yates says it's not yet clear what went wrong.

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