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French investigators searching for answers over the disappearance of flight MH370 have discovered a 89kg weight was added to the flight before take-off, it has been reported.

The doomed Malaysia Airlines plane was carrying 239 people when it disappeared while travelling from Kuala Lumpur to Beijing on March 8, 2014.

Ghyslain Wattrelos, a French national who lost his wife and two teenage children in the disaster, said last week there may be new evidence surrounding what happened.

Two Parisian judges are currently conducting a judicial investigation, and have received a report on the passengers and baggage brought on board, French newspaper Le Parisien reported.

Mr Wattrelos told the paper: “It was also learned that a mysterious load of 89 kg had been added to the flight list after take-off.

“A container was also overloaded, without anyone knowing why. The expert draws no conclusion.

“It may be incompetence or manipulation. Everything is possible. This will be part of the questions for Malaysians.”

There are numerous theories over what happened to MH370 but there has never been a confirmed discovery of the wreckage.

Earlier this year, authorities said debris washed up on the coast of Madagascar "most likely" belonged to the missing flight.

However a “significant lack of evidence” has always made it impossible to say what caused the plane to divert from its flight path and disappear from radar less than 40 minutes after take-off.