An independent investigation report into Malaysia Airlines Flight 370 says the cause of the plane's disappearance still can not be determined and the "possibility of intervention by a third party can not be excluded".
On 29 May, Malaysia called off a three-month search by USA firm Ocean Infinity spanning 112,000 sq km in the southern Indian Ocean that ended with no significant findings. And a second, private search by US company Ocean Infinity that finished at the end of May also found no sign of the wreckage.
"It is possible that the absence of communications prior to the flight path diversion was due to the systems being manually turned off, whether by intent or otherwise", he said at a news conference, adding the report wasn't final and conclusive given the wreckage wasn't found.
"The turn back could not be attributed to an anomalous system", said Kok.
The safety report - required by the International Civil Aviation Organization after every accident - could not determine why the aircraft's transponder stopped transmitting location information, nor whether it broke up in mid-air or as it hit the southern Indian Ocean.
Kok said the investigators examined the history of the pilot and the first officer, and were satisfied with their background and training and mental health, noting that they were well rested and not under financial stress, and showed no evidence of any anxiety or stress.
"We can conclude that MH370 had turned back and the turn back was not because of anomalies in the mechanical system", he said.
The Malaysian police previously concluded there were no unusual activity on the home simulator.
Wang Zhuncai (C), whose daughter was aboard Malaysia Airlines flight MH370, cries in 2015 ahead of a briefing given by Malaysia Airlines. "No matter what we do, we can not exclude the possibility of a third person or third party or unlawful interference".
Investigators highlighted some mistakes made by the Kuala Lumpur and Ho Chi Minh City air traffic control centres and made safety recommendations to ensure such incidents do not occur again.
It did address one of the pervasive theories about the disappearance: that the plane may have been crashed on goal by a suicidal pilot.
He said investigators couldn't find any flaws with the plane and dismissed the theory that it was remotely controlled.
Although the report didn't come to many definitive conclusions, it did rule out several possibilities, including a theory that one or more of the pilots intentionally crashed the jetliner in an act of suicide.
"How could we call our report the final report when no victims have been found and without the bulk of the wreckage?" he said during a media briefing on the report at the Transport Ministry today. At the time of the crash, the plane had been carrying 221 kg of lithium-ion batteries.
Kok said the Malaysian government will reopen the full investigation if the airliner is eventually found.
Family members were allowed to read the report earlier Monday.
Although both have been cleared by the Australian government's investigation, there were rumors that Zaharie's marriage was falling apart and that he downed the plane after learning that his wife was about to leave him, the news site said.
The report comes two months after Malaysia called off a privately funded underwater search for the aircraft. The plane did not have a malfunction or defect that could explain the disappearance, he said.
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