Officials Worry Al Qaeda May Have New Undetectable Liquid Explosives

Imagine the security theater that's going to cause

There are growing concerns that an al Qaeda affiliate could use a new generation of liquid explosive, currently undetectable, in a potential attack, according to two senior U.S. government officials briefed on the terror threat that has prompted the closing of nearly two dozen U.S. embassies.

Though the Transportation Security Administration has long been concerned about liquid explosives being used in potential devices -- as it was during the failed Christmas Day bombing in 2009 -- the new tactic allows terrorists to dip ordinary clothing into the liquid to make the clothes themselves into explosives once dry.

"It's ingenious," one of the officials said.

Another senior official said that the tactic would not be detected by current security measures.