What caused a passenger jet to disappear in Asia?

There are a lot of theories, but so far few answers.

That mystery leads of today's edition of CNNSTUDENT NEWS.

Malaysia Airlines Flight 370 took off early Saturday morning from Kuala Lumpur, Malaysia.

It was carrying 239 people to Beijing, China, but had vanished from radar and tracking recordsat around 35,000 feet.

There was no distress signal, the weather was clear.

With nothing found as of last night, rescuers expanded their search area.

They are looking for clues in the Gulf of Thailand, between Malaysia and Vietnam.

As they are searching from air and sea, Interpol is investigating on the ground.

This is an international organization with ties to police from more than 180 countries.

And it's investigating whether people on the flight with stolen passports might have hadanything to do with its disappearance.

It's one of the biggest mysteries in the disappearance of Malaysia Airlines Flight 370.

How in a post 911 world did two passengers board an international flight with stolenpassports?

Even more surprising, they were in plain sight, among the names listed in Interpol's lost andstolen travel documents database.

One, since last year, the other, since 2012.

Both stolen in Thailand.

And it appears the two passengers who used the passports of an Italian and an Austriancitizen, bought their tickets together.

When you book your ticket, the airlines isn't able to actually make an inquiry with Interpol oreven the local police about whether you're wanted or whether the passport has been reportedstolen.

The country-the government does.

And according to Interpol last year alone, passengers were able to board planes without havingtheir passport screened against Interpol's databases more than one billion times.

The database and Interpol headquarters in France contains an astounding 40 million records ofstolen travel documents.

You know, the member countries, the 190 members that belong to Interpol are not charged afee for accessing any of those databases.

So, if the country has sufficient resources and technical capability to wire into - to Interpol'svirtual private network that's running 24 hours a day.

And, you know, they certainly would be able to access that database and check it-it's just upto the wheel of the country to set it up and do it.

Interpol Secretary General Ronald Noble said, now we have a real case where the world isspeculating whether the stolen passport holders were terrorists,

while Interpol is asking why only a handful of countries worldwide are taking care to make surethat persons possessing stolen passports are not boarding international flights.