French experts said to be 'unsure' plane wreckage came from missing MH370

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Investigators 'know' it comes from a Boeing 777 but they still need to identify a number inside wing part to confirm it is missing jet.

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Experts in France have not been able to determine with certainty whether a piece of airplane wing found July 29 on an Indian Ocean island belongs to MH370, the Malaysian airliner carrying 239 people that disappeared 2014, a French source close to the investigation told CNN on Saturday, reports CNN.