“This is an unprecedented mystery”

Malaysian investigators said Vietnamese authorities had not confirmed sighting any debris from the Boeing 777-200, which was flying to Beijing on Saturday when it disappeared from radar screens.

“Unfortunately, we have not found anything that is from the missing aircraft,” Azharuddin said.

On Sunday, Vietnam’s Civil Aviation Authority said a Vietnamese navy plane had spotted an object in the Gulf of Thailand that was suspected to be part of the aircraft. But searchers were unable to find the object, the head of Vietnam’s search and rescue center told The Associated Press on Monday.