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By Eveline Danubrata and Mark Hosenball KUALA LUMPUR/WASHINGTON (Reuters) - The so-far fruitless search for a missing Malaysian airliner entered its fourth day on Tuesday, as sources in Europe, the United States and Asia voiced growing scepticism that the flight lost with 239 people on board was the target of an attack. The massive search has drawn in navies, military aircraft, coastguard and civilian vessels from 10 nations, but failed to turn up any trace of the Boeing 777-200ER that vanished about an hour into a flight from Kuala Lumpur to Beijing early on Saturday. "Until now, with all of our efforts, there is very little hope for any good news about this plane," said the head of Vietnam's search and rescue effort, Pham Quy Tieu. The search was widened on Tuesday to a larger swathe of the Gulf of Thailand and the South China Sea, around where the plane lost radio contact and vanished from radar screens.