Families of passengers on board missing Malaysia Airlines flight MH370 said on Monday that an investigation report released to them offered no new findings to explain the plane's mysterious disappearance.
The report highlighted three of the items definitely confirmed as being from MH370 were found on Reunion Island in the Indian Ocean, Mauritius and Tanzania.
"It is more likely that such manoeuvres are due to the systems being manipulated", the official air accident report by Malaysian, Australian, US, UK and Chinese aviation experts said.
"We are unable to determine with any certainty the reasons that the aircraft diverted from its filed planned route", Kok Soo Chon, chief inspector of the MH370 investigation team, told reporters in Putrajaya, outside Kuala Lumpur.
Voice 370, a group representing the relatives, has previously urged the Malaysian Government for a review of the flight, including "any possible falsification or elimination of records related to MH370 and its maintenance". "We can also not exclude the possibility that there's unlawful interference by a third party".
More broadly, the report said investigators had found no evidence that the pilot or crew could be behind the disaster.
He said: "We can not establish if the aircraft was flown by anyone other than the pilot, but we can not exclude the possibility of unlawful interference by a third party".
Investigators have ultimately had to conclude they do not know what happened to the plane.
He added: "I'm not ruling out anything, but there were two psychiatrists in my team and they were responsible for examining the audio recordings of the pilot and they concluded there was no anxiety and no stress in the recording, it was just normal, and they also recorded the footage from CCTV ... they didn't find any significant behavioural changes".
Investigators could not come to a conclusion about the fate of the
A few pieces of wreckage from MH370 did wash up in Africa but no bodies have ever been recovered.
There was a 2.4-ton shipment of lithium ion batteries on board that had not been scanned because there were no X-ray machines big enough, as well as 4.5 tons of mangosteen fruit.
The investigators did issue a criticism of air traffic controllers in Malaysia and Vietnam for not sounding the alarm immediately, meaning search and rescue operations were delayed. This however meant that the plane's change of course "was likely made while the aircraft was under manual control and not the autopilot", the report said.
After years combing an online map of the Indian Ocean, the amateur crash investigator claimed to have found the wreckage "riddled with bullet holes".
The last communication from the plane was from the Captain Zaharie Ahmad Shah who signed off with "Good night, Malaysian three seven zero", as the plane left the Malaysian airspace and later turned off course.
The report also dismissed one conspiracy theory about the plane's disappearance - that it was taken over remotely to foil a hijacking, saying there was no evidence to support this.
Monday's report is the culmination of a search led by the Malaysian government, which covered 112,000 square kilometers (43,243 square miles) in the southern Indian Ocean since January.
Newly elected Prime Minister Mahathir Mohamad has said Malaysia would consider resuming the search for MH370 only if new clues come to light.