REPUBLIKA.CO.ID, KUALA LUMPUR/PHU QUOC ISLAND - Dozens of ships and aircraft from 10 countries scoured the seas around Malaysia and south of Vietnam to find any trace of a Malaysian Airliner or 239 people on board, on Monday. 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. A senior police official told Reuters that people armed with explosives and carrying false identity papers had tried to fly out of Kuala Lumpur in the past, and that current investigations were focused on two passengers who were on the missing plane with stolen passports.

"We have stopped men with false or stolen passports and carrying explosives, who have tried to get past KLIA (airport) security and get on to a plane," he said. "There have been two or three incidents, but I will not divulge the details."

Interpol confirmed on Sunday at least two passengers used stolen passports and said it was checking whether others aboard had used false identity documents. Azharuddin said a hijacking attempt could not be ruled out as investigators explore all theories for the loss of Malaysia Airlines Flight MH370.

"Unfortunately we have not found anything that appears to be objects from the aircraft, let alone the aircraft," he told a news conference, earlier. "As far as we are concerned, we have to find the aircraft. We have to find a piece of the aircraft if possible."

Azharuddin also said the two men with stolen passports did not look like Asians, but he did not elaborate. Airport CCTV footage showed they completed all security procedures, he said.

"We are looking at the possibility of a stolen passport syndicate," he said.

Hopes for a breakthrough rose briefly when Vietnam scrambled helicopters to investigate a floating yellow object it was thought could have been a life raft. But the country's Civil Aviation Authority said on its website that the object turned out to be a "moss-covered cap of a cable reel".

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