Terror Talk Growing Louder on the Web

CBS News has learned that U.S. Intelligence officials are seeing a marked increase in terror-related Internet chatter with a frightening focus: Jihadists bent on finding gaps in airport security - all linked to al Qaeda in Yemen, reports CBS News chief investigative correspondent Armen Keteyian.

On one radical website, a writer invites fellow members to post information on how to bypass airport screening.

Another member asks about explosive detection devices, writing: "We have that system in place in Algiers...does anyone know if it's capable of detecting [the flammable gas] butane?"

On another Jihadist site, a visitor questions security involving 3D scanners at British airports asking: "Can I refuse [to pass through] for religious reasons?"

Before long comes this answer: "…advise those who wish to avoid the Heathrow scanners to take the train to Paris... and then board a plane from there."

Perhaps most disturbing -- the recent discovery of a confidential TSA document on a Yemeni Web site discussing the rules for searching passengers.