U.S. warned airlines this week about possible shoe bomb threat to U.S.-bound flights . Intelligence collected by the United States and other countries indicates terror groups have been working on new shoe-bomb designs , sources familiar with the matter told CNN on Wednesday . Official ties it to bomb-maker for al Qaeda in the Arabian Peninsula . The threat is based on the latest intelligence . Score: 6
U.S. warned airlines this week about possible shoe bomb threat to U.S.-bound flights . Official ties it to bomb-maker for al Qaeda in the Arabian Peninsula . The threat is based on the latest intelligence . Score: 6