Malaysian Prime Minister Najib Razak says in Kuala Lumpur thatinvestigators have evidence that the missing jet's communications were deliberately disabledand it turned back from its route to Beijing.He says Data suggested "with a high degree of certainty" thatthe plane's two automated communication systems were switched off one after the other before it reached the point over the South China Seawhere it lost civilian radar contact.The prime minister says the authorities are now trying to trace the airplane across two possible "corridors,"a northern corridor from the border of Kazakstan and Turkmenistan through to northern Thailand,and southern corridor from Indonesia to southern Indian Ocean.He said the expanded search area is based on the latest available satellite data.He denied earlier media report that the plane was hijacked.A massive international search began initially in the South China Seawhere the plane's transponders stopped transmitting.It has since been expanded onto the other side of the Malay Peninsula up into the Andaman Sea and into the Indian Ocean.
