Malaysia’s Civil aviation Chief has said the fate of a missing Malaysia Airlines jet remains ” a mystery”

Azharuddin Abdul Rahman said officials had not ruled out hijacking as a cause of the plane’s disappearance.

The possible sighting of a yellow life raft was investigated on Monday, but was found to be an unrelated object.

Malaysia Airlines flight MH370 vanished from radar almost three days ago en route to Beijing from Kuala Lumpur, with 239 people on board.

Relatives of the missing passengers have been told to prepare for the worse.