The Transportation Security Administration is sending information to some international airports and air carriers about possible security measures for passengers traveling to the U.S.

A Homeland Security official says the guidance is not new but a reminder of methods the U.S. provided to these international airports and carriers in the past six to eight months to help protect against threats. Those threats include liquid explosives and explosives hidden inside a person's body or clothes and in printer cartridges. All are methods that officials say al-Qaida's spinoff group in Yemen is considering for plots against the U.S.

The official spoke only on condition of anonymity.

The CIA recently foiled a bomb plot in Yemen in which a suicide bomber would have detonated an explosive on a U.S.-bound flight.


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