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(CNN) – Three days after it seemingly vanished, the search for missing Malaysia Airlines Flight 370 continues.
Adding to the mystery is the fact that at least two people on board were traveling on stolen passports.
According to Thai police officials, an Iranian man by the name of Kazem Ali purchased the tickets for two friends who he said wanted to return home to Europe. While Ali made the initial booking by telephone, either Ali or someone acting on his behalf paid for the tickets in cash, according to police.
"It doesn't smell well at this time," said aviation security expert Rafi Ron, president of New Age Security Solutions.
"There's a good reason for not feeling comfortable with the findings that we have until now," said Ron, but he adds that there is still no proof that this is a terrorist attack.
For more of our interview with aviation security expert Rafi Ron, check out the video above.