"We have been seeking but no signal from the plane yet," Pham Hien, director of a Vietnam maritime search and rescue coordination centre in Vung Tau, said by telephone.

Vietnamese and Chinese media had reported that a signal from the plane had been picked up. The reports did not identify what kind of signal.

"The information on local media about the signal near the Cape Ca Mau was inaccurate," Pham said.

No Indian national were onboard the Beijing bound flight, claimed a news agency.

If the plane is found to have crashed, the loss would mark the second fatal accident involving a Boeing 777 in less than a year, after an unblemished safety record since the jet entered service in 1995.

 (JPN/Agencies)

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