Malaysian officials said an airplane wing part found last week on the remote Indian Ocean island of Ré union came from the same type of aircraft as Malaysia Airlines Flight 370, raising hope it will offer clues to solving the mysterious disappearance of the jet nearly 17 months ago.

French officials, however, declined to confirm Malaysia's assertion before an analysis of the part officially begins Wednesday, underscoring the confusion that has emerged in the sprawling, multinational investigation. Local officials in Ré union were also sifting through reports of new debris found on the island, a French territory off the east coast of Madagascar, as scavengers came to the beach looking for other parts that could have washed up on the beach.

Malaysia Transport Minister Liow Tiong Lai identified the plane piece that washed ashore Wednesday as part of a Boeing 777, the same model as Flight 370. Mr. Liow said French authorities, Boeing, and the U.S. National Transportation Safety Board agreed that the piece was from a 777. Mr. Liow didn't say whether the part belongs to the missing flight.

If the piece is identified as a Boeing 777 part, it would almost certainly come from Flight 370. Only two other Boeing 777s have ever crashed, and neither was anywhere near the Indian Ocean.

But a spokeswoman for the Paris prosecutor's office, which is leading the investigation into the wing part, said French authorities have yet to come to that conclusion. The examination was set to begin Wednesday at a high-tech military defense lab near Toulouse with expertise in analyzing airplane debris.

French judicial authorities have convened a meeting in Paris for Monday to give order to an investigation that has captured the world's attention, after days of sometimes conflicting statements.

Jim Hall, a former chairman of the U.S. National Transportation Safety Board, said the confusion and lack of clear leadership amounted to "a slippery slope" that threatens to undermine public confidence in the expertise and independence of the overall investigative effort.

Mr. Hall said in an interview that the current confusion sets a bad precedent for future international probes. The investigations of Flight 370 and last year's downing of another Malaysia Airlines flight over Ukraine, he added, appear to have "a greater amount of secrecy and lack of disclosure" than nearly any recent high-profile air-crash probes.

Monday's meeting is supposed to spell out which authorities are in charge of each element of the probe, including whether French civil air accident investigators or military technical experts will lead the examination of the recovered debris, said a French official. A delegation of Malaysian officials is also in France to participate in the investigation. Officials from the U.S. government or Boeing are expected to have a role in the probe.

In Ré union, police were deluged with reports of metallic objects found on the island's rocky beaches. The police did collect at least one of these items: Early Sunday, an official with the prefecture of Saint Denis, Ré union's main town, said an airplane door had been found on the island's northern coast. But other local officials and residents described the debris as a collection of much smaller metallic objects that may or may not be from an airplane.

Some residents feared that frequent claims that Ré union beach refuse might have come from the missing plane could strain the small island's public services. "They can't chase down every scrap," said high-school teacher Franç ois Jeanmart, who saw many treasure seekers along the oceanfront during his Sunday bike ride along Ré union's northeastern promenade. "It's difficult to differentiate a plane piece from a washing machine piece."

Jean-Yves Sambimanan, a spokesman for the town where the piece of broken wing was found Wednesday, said he had nothing to do now except alert officials in Paris if any more debris does turn up.

"Everything to do with the investigation is happening in France, they are guiding things," he said.

Mr. Liow, Malaysia's transport minister, also called on other nations in the vicinity of Ré union to be on the lookout for more potential airline debris that may wash up onto their shores.

"This is to allow the experts to conduct more substantive analysis should there be more debris coming on to land," he said, "providing us more clues to the missing aircraft."

French officials involved in the probe, however, said they are concerned their work could be slowed by having to examine a deluge of items that have washed ashore but have no link to the current probe.

Australia has been leading the search for the aircraft hundreds of miles off its western coast. Investigators believe the plane, on its way to Beijing from Kuala Lumpur on March 8, 2014, veered sharply left about an hour into the flight and crossed over Malaysia. Then, it most likely turned left again and continued south for thousands of miles before crashing in the eastern half of the Indian Ocean.

Australian aviation officials have said that ocean currents could well have pushed the wing part across the Indian Ocean to Ré union over the past 17 months from the area they are currently searching.

Locals on Ré union were considering what the deluge of international attention could mean for the island, a small economy dependent on sugar cane and tourism, and connected mainly by expensive flights to nearby Mauritius and distant France. Some said any press could only be good press.

"Now people know where we are," said Kay Botterman, a 34-year-old career counselor. "Most people just think the ocean is empty out here."

Jason Chow and Robert Wall contributed to this article.

Write to Matthew Dalton at Matthew.Dalton@wsj.com, Patrick McGroarty at patrick.mcgroarty@wsj.com and Robert Wall at robert.wall@wsj.com

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