Tighten security in a couple ways because dozens of americans are fighting with al qaeda especially in syria who could be learning bomb skills and could travel back to europe and united states freely. and secondly, new word the al qaeda group in yemen, which has been behind a few plots including the failed underwear bomber in 2009, has come up with new ways to avoid security detection and are supposedly on the ground in syria giving hands-on training. >> do we know if this is a specific threat or a long-time precaution? >> officials are warning this is just more precautionary americass and -- ...