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Thai air force and civil aviation authorities said Monday they were unaware of the statement from Japan, while the agency within the Transport Ministry that investigates aviation accidents was unavailable for comment.

Japan has launched H-IIA and H-IIB rockets since the 2000s. The most recent H-IIA launch was in November 2015.

Flight 370 took off from Malaysia in March 2014. It lost communications and made a sharp turn away from its Beijing destination before disappearing. It is presumed to have crashed in the southern Indian Ocean, far away from Thailand.

The debris was found on the eastern coast of southern Thailand’s Nakhon Si Thammarat province, about 600 kilometres south of Bangkok on the Gulf of Thailand.

Malaysian Transport Minister Liow Tiong Lai said Sunday that the search for the missing jet, which carried 239 people, is ongoing in the Indian Ocean and that its second phase is expected to be completed by June. Australia has led a multinational search that has so far cost more than US$120 million.

Aviation experts from Malaysia visited Nakhon Si Thammarat on Monday to inspect the metal piece, after which the Thai air force flew it to Bangkok for further examination.

The Australian Transport Safety Bureau announced Monday that the search of 120 square kilometres of seabed where the Boeing 777 is thought to have crashed had been set back after a ship lost its sonar equipment.

The Fugro Discovery, one of three ships conducting the search, towed its side-scan sonar unit on Sunday into a mud volcano that rose 2,200 metres from the sea floor, the bureau said in a statement.

The ship lost the sonar unit plus 4.5 kilometres of cable. The ship is now making a six-day journey to the Australian port of Fremantle to collect new cable and will continue the search with spare sonar equipment, it said.

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Associated Press writers Grant Peck in Bangkok, Eileen Ng in Kuala Lumpur, Malaysia, and Rod McGuirk in Canberra, Australia, contributed to this report.