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By Anshuman Daga and Siva Govindasamy KUALA LUMPUR (Reuters) - A missing Malaysian airliner appears to have been deliberately steered off course after someone on board shut down its communications, Prime Minister Najib Razak said on Saturday. But the new satellite data gave no precise location, and the plane's altered course could have taken it anywhere from central Asia to the southern Indian Ocean, he said. The Malaysia Airlines Boeing 777-200ER vanished en route from Kuala Lumpur to Beijing in the early hours of March 8 with 239 passengers and crew aboard. "Despite media reports the plane was hijacked, I wish to be very clear, we are still investigating all possibilities as to what caused MH370 to deviate." Search operations by navies and aircraft from more than a dozen nations were immediately called off in the Gulf of Thailand and the South China Sea to the east of Malaysia, where the plane dropped off civilian air traffic control screens at 1:22 a.m. last Saturday (1722 GMT on Friday).