REPUBLIKA.CO.ID, KUALA LUMPUR - Vietnamese authorities searching waters for the missing Boeing 777 jetliner spotted an object Sunday that they suspected was one of the plane's doors, as international intelligence agencies joined the investigation into two passengers who boarded the aircraft with stolen passports.

More than a day and half after Malaysia Airlines Flight MH370 went missing, no confirmed debris from the plane had been found, and the final minutes before it disappeared remained a mystery. The plane, which was carrying 239 people, lost contact with ground controllers somewhere between Malaysia and Vietnam after leaving Kuala Lumpur early Saturday morning for Beijing.

The state-run Thanh Nien newspaper cited Lt. Gen. Vo Van Tuan, deputy chief of staff of Vietnam's army, as saying searchers in a low-flying plane had spotted an object suspected of being a door from the missing jet. It was found in waters about 90 kilometers (56 miles) south of Tho Chu island, in the same area where oil slicks were spotted Saturday.

"From this object, hopefully (we) will find the missing plane," Tuan said. Thanh Nien said two ships from the maritime police were heading to the site.

The missing plane apparently fell from the sky at cruising altitude in fine weather, and the pilots were either unable or had no time to send a distress signal — unusual circumstances under which a modern jetliner operated by a professional airline would crash.

Malaysia's air force chief, Rodzali Daud, said radar indicated that the plane may have turned back, but did not give further details on which direction it went or how far it veered off course.

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