A long-awaited official report into flight MH370's disappearance gave no new information about why the Malaysian plane vanished, sparking anger and disappointment among relatives of those who were on board.

Family members speak to the media after an MH370 closed door meeting in Putrajaya, Malaysia July 30, 2018.
Family members speak to the media after an MH370 closed door meeting in Putrajaya, Malaysia July 30, 2018. (Reuters)

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 comes two months after Malaysia called off a privately funded underwater search for the aircraft carrying 239 people that disappeared on its way to Beijing from Kuala Lumpur on March 8, 2014, in one of the world's greatest aviation mysteries.

The report highlighted mistakes and protocols and guidelines that were not followed, however, the families told reporters after a briefing on the report, set for release to the media at 06:30 GMT.

"We hope that these mistakes will not be repeated and that measures are put in place to prevent them in the future," said Grace Nathan, a lawyer whose mother, Anne Daisy, was on the plane.

Journalist Zan Azlee has the latest from Kuala Lumpur.

"The one point they stressed was that this report was not to assign blame, it was only a safety investigation," she said, adding that the investigators were limited in their effort, as it was based on information supplied to them.

On May 29, Malaysia called off a three-month search by US firm Ocean Infinity that spanned 112,000 sq km in the southern Indian Ocean and ended with no significant findings.

It was the second major search after Australia, China and Malaysia ended a fruitless $147 million search across an area of 120,000 sq km last year.

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."

The families said the report pointed to mistakes by the Malaysian air traffic control (ATC) centre. It showed there were only two attempted phone calls made to the aircraft from the ground, four to five hours apart.

The investigators could not provide adequate answers as to why no other calls were made after the jetliner went off the radar, Grace added.

Investigators looking into why the Boeing 777 veered thousands of miles off its scheduled route before eventually plunging into the Indian Ocean believe someone may have deliberately switched off MH370’s transponder before diverting it over the Indian Ocean.

Newly elected Prime Minister Mahathir Mohamad has said Malaysia would consider resuming the search for MH370 only if new clues come to light. 

Source: Reuters