Penske truck that tried to gain access to a restricted area. a federal law enforcement official told cnn that both bombs were small. and initial tests show no c-4 or other high-grade explosive material. suggesting the packages used in the attack were code devices. still >> there's a certain level of sophistication. having made these bombs before, it's not easy. you just can't get it on the internet, make two of these bombs go off fairly closely together. so somebody had some experience. somebody practiced. >> reporter: sourcesel cnn that one, possiy two, unexploded devices also were found. pot...