Vietnamese Officers looks out during a search and rescue mission off Vietnam's Tho Chu islandThe disappearance of a Malaysian airliner about an hour into a flight to Beijing is an “unprecedented mystery”, the civil aviation chief said on Monday, as a massive air and sea search now in its third day failed to find any trace of the plane or 239 people on board. Dozens of ships and aircraft from 10 countries scoured the seas around Malaysia and south of Vietnam as questions mounted over possible security lapses and whether a bomb or hijacking attempt could have brought down the Boeing 777-200ER which took off from the Malaysian capital, Kuala Lumpur. The area of the search would be widened from Tuesday, Azharuddin Abdul Rahman, the head of Malaysia’s Civil Aviation Authority, told reporters. MORE