from the mideast and africa. barbara starr has more. >> reporter: u.s. officials have gron increasingly concerned about the threats against aviation that they are seeing not just from isis but also al qaeda in syria and al qaeda in yemen. u.s. intelligence and law enforcement agencies believe that isis and other terror groups have developed innovative ways to plant explosives in electronic devices that can fool airport security screening. the concern is heightened because there is u.s. intelligence suggesting that terrorists have obtained sophisticated airport security equipment to test how well the bombs are concealed. cnn has learned this new intelligence was a significant part of the decision earlier this month to ban laptops, tablets, and other electronic devices from the passenger cabins of planes flying directly