Interpol says at least two passports used on the Boeing 777-200 were stolen and it is "examining additional suspect passports".Suspected fragments from the missing Malaysia Airlines plane carrying 239 people have been found off Vietnam.
The Vietnamese navy said an object, thought to be an aircraft door, was spotted by a rescue plane off the country's south coast.
Security services are investigating whether the Boeing 777-200 was destroyed in a terror attack.
Interpol said at least two passports used on the flight were stolen and it is "examining additional suspect passports".
The international police agency said it was of "great concern" that passengers were able to board the plane using stolen passports, and no checks were made against its database.
Flight MH370 disappeared almost two days ago off Vietnam's south coast.
The search area has been widened after radar data indicated the plane may have turned back.
The FBI and Boeing have joined the investigation after it was revealed four passengers may have been travelling on false passports.
Malaysia's defence and transport minister Hishamuddin Hussein told a news conference in Kuala Lumpur: "All the four names are with me."
Asked whether he believes the plane was hijacked, he would only say: "We are looking at all possibilities."
It emerged on Saturday that two men boarded the plane using stolen European passports.
They reportedly bought their tickets together from a travel agency in Pattaya, Thailand, and were due to fly on to Europe from Beijing.
The plane was travelling from Kuala Lumpur to Beijing when it vanished around two hours into the flight.
The plane disappeared from radar at 1.30am (5.30pm UK time) on Friday, about 85 miles (135km) north of the Malaysian city of Kuala Terengganu.
A huge search involving 22 aircraft and 40 ships is continuing in the vast waters of the Gulf of Thailand, between Vietnam and Malaysia.
It concentrated around the Vietnamese island resort of Phu Quoc after Vietnamese air force jets spotted two huge oil slicks.
The parallel slicks - both between 10 miles (16km) and 12 miles (19km) long and 500 metres apart - were consistent with the kind of spills caused by fuel from a crashed airliner, a Vietnamese government statement said.
The search has now widened to the sea off Malacca, on the west coast of Malaysia, after radar data indicated the plane may have turned back before disappearing.
http://www.mirror.co.uk/news/world-news/missing-malaysia-airlines-eerie-moment-3222919 - strange, read this article
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