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(USA TODAY) -- The fate of the missing Malaysian Airlines jet believed to have disappeared off the coast of Vietnam almost three days ago with 239 people aboard remains a mystery, officials said.

Malaysia's civil aviation head, Azharuddin Abdul Rahman, speaking to reporters in Kuala Lumpur Monday, said that investigators have so far not found anything that could be part of the missing plane.

But that statement came as Vietnam sent helicopters to investigate a floating "yellow object" suspected of being a life raft from flight MH370 bound for Beijing, Reuters reported. Vietnam's civil aviation body later ruled that out, saying the object was not from the plane.

Separately, six planes and seven ships from Vietnam have so far been unable to find an object spotted by a low-flying plane on Sunday afternoon, authorities said.

Doan Huu Gia, the chief of Vietnam's search and rescue coordination center, said the search for the rectangular piece of debris has proved unsuccessful.

Vietnamese officials said they believe the object is one of the plane's doors, according to local news media reports.

Vietnam civil administration chief Pham Viet Dung said search teams from several countries sent boats to the area about 56 miles south of Tho Chu island, in an area where an oil slick was spotted Saturday. Malaysian maritime officials found some oil slicks in the South China Sea and sent a sample to a lab to see if it came from the plane, Rahman told a news conference on Monday.

Authorities said earlier that they had spotted an object in the area that turned out not to be from the plane.

Flight MH370 vanished early Saturday two hours into a scheduled six-hour flight from Kuala Lumpur. A Malaysian official said Sunday the plane may have tried to return before disappearing.

READ THE FULL STORY: http://www.usatoday.com/story/news/world/2014/03/10/missing-malaysia-flight/6247113/

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