Malaysia's top police official warned Wednesday that authorities may never learn what caused the mysterious disappearance of flight MH370, as he indicated a three-week-old criminal investigation has so far been inconclusive.
"Give us more time," Inspector General of Police Khalid Abu Bakar told reporters in Kuala Lumpur, according to Dow Jones Newswires.
"We may not even know the real cause of this incident."
The sober assessment is unlikely to go down well with anxious family members of the missing passengers, especially Chinese relatives who have fiercely attacked Malaysia's government and the airline as incompetent "liars" and "murderers".
Two thirds of the 227 passengers were Chinese.
Malaysian police have said they were investigating the backgrounds of all 239 people on board the Malaysia Airlines jet, who included 12 crew members, as well as ground crew and flight engineers.
Their criminal probe has focused on the possibility of a hijacking, sabotage or psychological problems among passengers or crew.
Khalid was quoted by state news agency Bernama as saying that all of the passengers had been "cleared" by Malaysian police, but he indicated the plane's two pilots were still being looked at.
Authorities have earlier said background checks by more than a dozen countries on their nationals on the plane came back clear.
Attention has focused on the flight's captain, Zaharie Ahmad Shah, 53, and First Officer Fariq Abdul Hamid, 27, as Malaysia believes the plane was deliberately diverted by someone on board.
But no evidence has emerged to suggest a motive by either of the men, who appear to have been well-regarded by their peers.
Khalid said police had recorded more than 170 statements so far.
"This investigation is ongoing. There are still more people we need to interview," he said, according to Dow Jones, declining to provide further details while the probe was under way.
The Boeing 777 disappeared on March 8 shortly after take-off on an overnight flight from Kuala Lumpur to Beijing.
Malaysian police and FBI experts were examining a flight simulator assembled by captain Zaharie at his home, hoping to find any clues.
But Khalid said he was still awaiting feedback from experts examining the simulator, adding that so far nothing conclusive had emerged.
A multi-nation search for wreckage from the plane is under way in the Indian Ocean after Malaysia said satellite data indicated it may have gone down there.
The search was boosted Wednesday with the arrival of a British nuclear submarine in the Indian Ocean.
Ten planes and nine ships resumed the hunt Wednesday although authorities warned broken cloud, sea fog and isolated thunderstorms would reduce visibility.
But in a boost to the search effort, Britain's Royal Navy said the first submarine in the operation -- HMS Tireless -- has arrived in the area and "with her advanced underwater search capability will be able to contribute to the attempts to locate the missing plane".
Britain's HMS Echo is also due in the search zone shortly to assist Australia's Ocean Shield naval vessel, which is fitted with a U.S.-supplied "black box" detector and is expected to arrive on Friday.
Other authorities have warned that unless the wreckage -- and black box -- are found it may never be known what caused the plane to lose contact on March 8.
The battery-powered signal from MH370's black box -- which records flight data and cockpit voice communications that could indicate what happened -- usually lasts only about 30 days, with time fast running out to find it.
Australia has warned against expectations of quick success in the difficult task of recovering the black box from the deep and vast seas.
Retired Australian air chief marshal Angus Houston, who is heading a new coordination center in Perth, reiterated Wednesday that the odds were stacked against them.
"The reality is it's the most complex and challenging search and recovery operation I've ever seen," he told national radio.
"We have to keep searching and searching with vigor, because what's really vital here is to find some wreckage, some debris on the surface of the ocean."
"It's only through that that we'll hopefully lead to where the aircraft is on the bottom of the ocean."
The personal jet of Oscar-winning New Zealand movie director Peter Jackson is also now reportedly being used in the multinational hunt for the plane.
Jackson, the director of the "Lord of the Rings" and "The Hobbit" movies, has personally approved the use of his Gulfstream G650 in the search, Radio New Zealand said.
His spokesman reportedly said the company which operates the long-range aircraft had chartered it to Australian authorities.
Malaysian Prime Minister Najib is due Wednesday evening in Perth, where he will tour the air base being used as a staging post and meet with his Australian counterpart Tony Abbott.
Malaysia's handling of the crisis, marked by piecemeal and occasionally contradictory information, has been widely questioned, especially by distraught relatives of the 153 Chinese nationals aboard.
Many of them have alleged incompetence or even a cover-up by Malaysia, straining ties between the two countries, although the rhetoric has eased in recent days.
In an effort to appease angry relatives, a closed-door briefing is scheduled for Wednesday in Kuala Lumpur with families of those who were on board the plane to hear from technical experts from Malaysia, China and Australia.
On Tuesday, Malaysia Airlines revealed the full radio communications with the pilots of MH370, but the routine exchanges shed no light on the mystery and Malaysia said there was "no indication of anything abnormal".
The conversations with air traffic controllers had been the subject of much speculation as suspicions have focused on whether one or both of the pilots deliberately diverted the plane.
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