French investigators have been unable to confirm if the piece of plane wing found on Reunion Island was indeed from the missing flight MH370.

At the time of the discovery on the French territory last month, Malaysian officials said it was 'almost certain' the wing flap came from a Boeing 777 – the same model as the Malaysian airlines jet.

The 6ft-long wing flap washed up 3,500 miles from the doomed jet's last-known location, fuelling hopes across the world that one of aviation's greatest mysteries could finally be solved.

The 6ft-long wing flap washed up 3,500 miles from the doomed jet's last-known location

Speaking at the time of the debris discovery Malaysian Deputy Transport Minister Aziz Kaprawi expressed confidence in the idea that the flap was from the plane

It was thought that the six-foot-long piece of debris may have been a 'flaperon' from the edge of a plane's wing.

Speaking at the time of the debris discovery Malaysian Deputy Transport Minister Aziz Kaprawi expressed confidence in the idea that the flap was from the plane.

He said it is 'almost certain' that the debris belongs to a Boeing 777 aircraft, adding: 'Our chief investigator here told me this.'

Malaysian Prime Minister Najib Razak also shared Mr Kaprawi's confidence at the time, saying it was also 'very likely'.

At the time of the discovery last month, Malaysian officials said it was 'almost certain' the wing flap came from a Boeing 777 – the same model as the Malaysian airlines jet

Authorities have struggled to find any answers for why the plane suddenly veered off course in March 2014

However, since the flaperon was shipped to France for verification, the BEA, the French body responsible for civil aviation accident investigations has revealed they couldn't be certain the debris was from the lost plane.

There was also rumours that the debris had a serial number printed on the side, linking it to the lost plane.

A suspected torn-off part of the aircraft had led to speculation that other pieces would drift from the crash site but little else has turned up.

There were also rumours that the debris had a serial number printed on the side, linking it to the lost plane

Officials inspect an possibly piece of plane wreckage, which washed up on to the beach in Reunion

If the Indian Ocean currents had carried a large piece of a wing some 3,000 miles, it was expected that other smaller items from the plane, particularly luggage, seat cushions and blankets might surface on the Reunion coastline.

Authorities have since struggled to find any answers for why the plane suddenly veered off course in March 2014.