Search and rescue planes scour the waters off southern Vietnam, looking for any trace of a Malaysia Airlines jetliner. The aircraft vanished from radar screens in the early hours of Saturday with 239 people on board. Flight MH370 from Kuala Lumpur went missing about an hour into its flight to Beijing. Malaysia's civil aviation chief has said the fate of a missing jet remains "a mystery". He did not rule out a hijacking as a possible cause.
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