Malaysia’s military believes a jetliner missing for almost four days turned and flew hundreds of kilo­metres to the west after it last made contact with civilian air traffic control off the country’s east coast, a senior officer told Reuters yesterday.

In one of the most baffling mysteries in recent aviation history, a massive search operation for the Malaysia Airlines Boeing 777-200ER has so far found no trace of the aircraft or the 239 passengers and crew.

Malaysian authorities have previously said flight MH370 disappeared about an hour after it took off from Kuala Lumpur for the Chinese capital Beijing.

“It changed course after Kota Bharu and took a lower altitude. It made it into the Malacca Strait,” the senior military officer, who has been briefed on investigations, told Reuters.

That would appear to rule out sudden catastrophic mechanical failure, as it would mean the plane flew around 500 kilometres at least after its last contact with air traffic control, although its transponder and other tracking systems were off.

At the time it lost contact with civilian air traffic control, the plane was roughly midway between Malaysia’s east coast town of Kota Bharu and the southern tip of Vietnam, flying at 35,000 feet (10,670 metres).

The Strait of Malacca, one of the world’s busiest shipping channels, runs along Malaysia’s west coast.

Malaysia’s Berita Harian newspaper quoted air force chief Rodzali Daud as saying the plane was last detected at 2.40am by military radar near the island of Pulau Perak at the northern end of the Strait of Malacca. It was flying about 1,000 metres lower than its previous altitude, he was quoted as saying.

A huge search operation for the plane has been mostly focused on the shallow waters of the Gulf of Thailand off Malaysia’s east coast, although the Strait of Malacca has been included since Sunday.

Navy ships, military aircraft, helicopters, coastguard and civilian vessels from 10 nations have criss-crossed the seas off both coasts of Malaysia without success.

The fact that at least two passengers on board had used stolen passports has raised suspicions of foul play. But Southeast Asia is known as a hub for false documents that are also used by smugglers, illegal migrants and asylum seekers. Interpol Secretary General Ronald Noble named the two men as Iranians aged 18 and 29, who had entered Malaysia using their real passports before using the stolen European documents to board the Beijing-bound flight.

The more information we get, the more we are inclined to conclude it is not a terrorist incident

“The more information we get, the more we are inclined to conclude it is not a terrorist incident,” he said.

Malaysian police chief Khalid Abu Bakar said the younger man, who he said was 19, appeared to be an illegal immigrant. His mother was waiting in Frankfurt and had been in contact with authorities, he said.

“We believe he is not likely to be a member of any terrorist group, and we believe he was trying to migrate to Germany,” Khalid said. Asked if that meant he ruled out a hijack, he said: “(We are giving) same weightage to all (possibilities) until we complete our investigations.”

Both men entered Malaysia on February 28, at least one from Phuket, in Thailand, eight days before boarding the flight to Beijing, Malaysian immigration chief Aloyah Mamat told the news conference.

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