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By Eveline Danubrata and Niluksi Koswanage KUALA LUMPUR (Reuters) - Malaysia's military believes it tracked a missing jetliner by radar over the Strait of Malacca, far from where it last made contact with civilian air traffic control off the country's east coast, a military source told Reuters. In one of the most baffling mysteries in recent aviation history, a massive search operation for the Malaysia Airlines Boeing 777-200ER, now in its fourth day, has so far found no trace of the aircraft or the 239 passengers and crew. "It changed course after Kota Bharu and took a lower altitude. The airline said on Saturday that radio and radar contact with Flight MH370 was lost off the east coast Malaysian town of Kota Bharu.