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By Anshuman Daga and Siva Govindasamy KUALA LUMPUR (Reuters) - Investigators believe someone aboard a missing Malaysian airliner deliberately shut off its communications and tracking systems, turned the plane around and flew for nearly seven hours after it vanished, Prime Minister Najib Razak said on Saturday. Shortly after the prime minister finished speaking police arrived at the home of the missing aircraft's pilot to search for evidence, a senior police official told Reuters. As the unprecedented search for Flight MH370 and its 239 passengers and crew entered its second week, Najib told a news conference that the hunt for wreckage around the scheduled flight path to the east of Malaysia was being called off. The fate of the Malaysian Airlines Boeing 777-200ER has been shrouded in mystery since it disappeared off Malaysia's east coast less than an hour into a March 8 scheduled flight from Kuala Lumpur to Beijing.