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France has launched air, land and sea searches on and around the island of Reunion in the hope of finding more debris which could be linked to MH370.
Malaysia has said a wing section found on the French Indian Ocean island came from the lost Malaysia Airlines flight.
But French investigators have yet to confirm the link.
The relatives of the passengers – who were mostly Chinese – have protested at the Malaysian embassy in Beijing.
Flight MH370 was travelling from Kuala Lumpur to Beijing on 8 March 2014 when it vanished from radar. The Boeing 777 had 239 people on board.
A military plane is scouring the seas around Reunion for possible MH370 debris
Does debris solve the MH370 mystery?
Relatives: ‘They won’t tell us the truth’
The families of those aboard have been angered by the apparent discrepancies in statements by French and Malaysian officials, and have accused the authorities of hiding the truth.
On Friday, they held a protest outside Malaysia Airlines’ offices in Beijing, before scuffling with police at the gates of the Malaysian embassy.
Lu Zhanzhong, whose son was aboard the plane, told AFP news agency that the families wanted to go to Reunion to “see the truth”.
“I want to see if my son’s luggage is there,” he said.
At the scene: John Sudworth, Beijing
On one level, you could argue, it is simply a refusal to accept the obvious.
The evidence after all is strong; the satellite data shows the flight ended in the southern Indian Ocean and now the debris find – matching the sea current patterns – adds further corroboration.
But the unwillingness of many of the Chinese relatives to believe that conclusion is not as illogical as it sounds.
There are indeed real question marks over the way the Malaysian authorities have handled both the search for the plane and the release of information – marred by delay, confusion and apparent self-interest.
And here in China too, the families feel there is no-one they can trust. There are no independent media voices campaigning on their behalf or doggedly pursuing the truth.
Their own attempts to demand answers have been met with the usual control and harassment by plain-clothes policemen.
Bewildered and despairing, it is perhaps little wonder that some find comfort in the myriad conspiracy theories swirling online; that the plane might not be at the bottom of the ocean and that their loved ones might still be alive.
The relatives still searching for answers
Dominique Sorain, the top French government official for Reunion, said a military transport plane had begun patrolling the island’s coastal waters and a ship had also departed but had to turn back because of bad weather.
He said helicopters would also take part while soldiers and policemen would patrol the eastern part of the island where the wing part was found.
“This… will last a week, after which we will draw our first conclusions,” he said.
Mr Sorain said some objects found on the beaches since last week had been placed under seal until they could be examined, but he said it was not clear if these belonged to a plane or not.
BBC