seaboard with a risk for thunderstorm to continue. >> all right, thank you for following it. we have new information about the shoe bomb warning that went to airlines this week. officials are paying attention for two reasons. the threat is linked to an aggressive al qaeda affiliate in yemen and two, linked to a master bomb maker. cnn's barbara starr is live at the pentagon. does it check out on your end? >> absolutely, good morning, chris. this master bomb maker and his al qaeda group in yemen have been the big worry for some time. now they may be on the move again. a u.s. official says it is a credible threat, tied to al qaeda, which has never given up its intent to attack the u.s. again. there's no specific target but the concern is al qaeda will try to place a shoe bomb on an airplane bound for the u.s. a second u.s. official says the tsa warning stems from intelligence tied to the yemen