Investigators released a report on missing Malaysia Airlines flight MH370 on Monday, saying the Boeing 777's controls were likely deliberately manipulated to take it off course but they were not able to determine who was responsible.
The 465-page safety investigation report said the cause of the disappearance of Flight MH370 can not be determined until the plane wreckage is found, but did speculate on the possibility that there was intervention "by a third party".
"If the wreckage has not been found, if no victims have been found, how can we call our report the final report?" he said.
The report had concluded with MH370 deviating from its path and that flight simulator trials established that the aircraft's turnback was likely made while it was under manual control. "No matter what we do, we can not exclude the possibility of a third person or third party or unlawful interference".
Three pieces of wreckage believed to be from MH370 have been found from as far north as Tanzania and as far south as South Africa.
The recorded changes in the aircraft flight path following waypoint IGARI, heading back across Peninsular Malaysia, turning south of Penang to the north-west and a subsequent turn towards the Southern Indian Ocean were hard to attribute to any specific aircraft system failures.
A forensic report by the Malaysian police previously concluded that there were no unusual activities other than game-related flight simulations.
The report reiterated Malaysia's assertion the plane was deliberately diverted and flown for over seven hours after severing communications.
The disappearance of flight MH370 remains unexplained - what could have caused an entire plane to disappear?
"There was no record of malfunction or defect in the aircraft that could have contributed to the disappearance", said Kok. The report "lacks depth" and may not help prevent such incidents in future, she said, adding the search for the missing plane must continue.
Relatives of passengers on board the missing MH370 speaks to media. Credit PA
"We have examined the pilot and the first officer and we are quite satisfied with their background, with their training, with their mental health", he said.
A media briefing by the Malaysian safety investigation team said the plane was under manual control when it turned back, rather than flying on autopilot.
On May 29, Malaysia called off a three-month search by USA firm Ocean Infinity that spanned 112,000 square kilometres in the southern Indian Ocean and ended with no significant findings.
This follows an exhaustive 495-page MH370 safety Investigation report which also detailed that the Malaysian air traffic controllers did not initiate the three emergency phases in accordance with the standard operating procedures (SOP) in a timely manner.
Journalist Zan Azlee has the latest from Kuala Lumpur. "We removed them one-by-one and saw what remained behind", he said.
Families of those onboard the flight were given the full report to read this morning and have had a briefing with the investigations team.
The Malaysian government ended the search in May and on Monday released its final report into the disappearance.
The majority of passengers on board were Chinese.
There have been a host of theories about why the plane disappeared, ranging from an accident to a hijacking or even a terror plot.