The communications systems of missing Malaysia Airlines flight MH370 were deliberately disabled, Malaysia's Prime Minister Najib Razak has said.
According to satellite and radar evidence, he said, the plane then changed course and could have continued flying for a further seven hours.
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According to a military radar, the flight then turned and flew back over Malaysia before turning north-west.
A satellite was able to pick up a signal from the plane for some seven hours after it lost radar contact, although it was unable to give a precise location, Mr Razak said.
He went on to say that based on this new data, investigators "have determined the plane's last communication with a satellite was in one of two possible corridors":
a northern corridor stretching from the border of Kazakhstan and Turkmenistan through to northern Thailand
a southern corridor stretching from Indonesia to the southern Indian Ocean