correspondent jim sciutto has been digging on this, as well. do we know exactly what we're talking about, these devices? >> we know this is a threat that involves al qaeda in the arabian peninsula and the means of attack concealed bombs on airplanes that truly keep counter terror officials up at night. we're told the u.s. is now considering new screening measures at airports due to new information about attempts to build explosive devices designed to get past those airport screeners. they are homeland security's most dreaded threats. explosive devices hidden in objects from shoes to toothpaste tubes and undetect be by airport security. now the u.s. is considering new airport security measures due to increased concerns that terrorists from al qaeda in the arabian peninsula or aqap are developing new bomb designs to fool current security screening. >> we remain concerned about the capability of some of these