The Vietnam Air Force has reportedly spotted two oil slicks in the sea, thought to be from a plane missing off the coast.
Search teams from several countries are looking for traces of a Malaysia Airlines Boeing 777.
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The flight from Kuala Lumpur to Beijing was carrying 239 passengers and crew – although no Irish people were on board.
It disappeared about two hours into the flight.
The Malaysian Prime Minister Najib Razak is refusing to speculate about any terrorist involvement.