Australia's transport minister says two plane parts found in Mozambique "almost certainly" came from missing Malaysian Airlines flight MH370.

The two pieces of debris were found separately by members of the public and were flown to Australia for analysis.

Darren Chester said the finds were "consistent with drift modelling" of how debris from the missing plane may have been carried by ocean currents.

MH370 vanished in March 2014 with 239 people on board.

It went out of contact while flying from the Malaysian capital Kuala Lumpur to Beijing and is widely believed to have gone down in the Indian Ocean after veering off course for unknown reasons.

The fate of the plane, its passengers and crew remains one of aviation's biggest unsolved mysteries.

MH370-linked debris

-A section of wing called a flaperon, found on Reunion Island in July 2015 - the only piece confirmed to have come from MH370 so far

-Piece found in Mozambique in December 2015 - "almost certainly" from the plane

-"No step" piece found in Mozambique in February 2016 - "almost certainly" from the plane

-Piece with partial Rolls Royce logo found in March 2016 in South Africa - in the process of being examined

One of the parts retrieved in Mozambique was found on a sandbank by an amateur US investigator in late February. That find prompted a South African tourist to come forward with a piece he found in Mozambique in December.

Chester said the investigation team had finished examining the debris and found both were "consistent with panels from a Malaysia Airlines Boeing 777 aircraft", the same make as the missing plane.

"The analysis has concluded the debris is almost certainly from MH370," he said in a statement.

He said it showed that the vast deep-sea search for the plane in the southern Indian Ocean, being led by Australia, was focusing on the right place.

The search, also involving experts from China and Malaysia, is scanning the sea floor, much of it previously unmapped, in the hope of locating the wreckage.

Chester said it would continue for now, with 25,000 sq km (10,000 sq miles) of ocean still be to searched.

"We are focused on completing this task and remain hopeful the aircraft will be found."

But the three countries have said that barring significant new evidence, they will end the operation once the area has been fully searched. The search is expected to be completed in the coming months.

Meanwhile, officials are arranging to collect and examine a fourth piece of debris, found at Mossel Bay in South Africa's southern coast on Monday by a local archaeologist.

It apparently bears a part of the logo of Rolls Royce, the British company which manufactures engines for aircraft including the Boeing 777.