Because authorities are still clueless what really happened to the Boeing 777 jet of Malaysian Airlines Flight 370, they are now considering other explanations behind the mysterious disappearance of the ill-fated plane.
Azharuddin Abdul Rahman, the civil aviation chief of Malaysia, raised the spectre of engine failure, pilot error or suicide.
Despite the use of 40 vessels and 34 aircraft for the multinational search-and-rescue mission, there is still no conclusive clue or evidence that the plane had crashed into Vietnam waters despite the discovery of an oil slick and debris.
The debris turned out to be a sea cable covered with moss, not a life raft.
Authorities are also looking into the possible terrorism angle as it acquired more information about the two identity thieves who used stolen Italian and Austrian passports to board the jet.
Reports said that a certain Mr Ali purchased the tickets of the two from a travel agent. Grand Horizon travel agency owner Benjamin Krutnait said that the man sought cheap airfares without specifying Malaysian Airlines.
Mr Rahman disclosed that the two were not Asian-looking, which belied the previous statement made by the Malaysian home minister that the imposters had Asian appearance, and they passed through all security protocols before the boarded the aircraft.
It includes screening of the persons and their baggage, including hand-carried items which fully met all immigration security standards. Given these information, the other explanation for the use of the stolen passport is the two being part or clients of a stolen passport syndicate.
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Officials also disclosed that five passengers checked-in but didn't board the plane and their luggage were taken off the jet, although officers are still unclear if the five are involved at all with the mystery behind the missing jet.
After three days of search, the only conclusion reached is that the missing plane remains a mystery.
Meanwhile, an email was sent to various media in China from an unknown group called Chinese Martyr's Brigade which claimed it was behind the disappearance of the plane. The email warned, "You kill one of our clan, we will kill 100 of you as payback," although Malaysia believes it is a hoax.
However, what is not a mystery but a quandary is the impact of the disappearance on Malaysian Airlines' bottom line.