There is no indication that such a bomb has been created but probably some information suggest a possible direction of action for the terrorists. Previously and even a few years ago, three nonmetallic bombs were placed on U.S.-bound airliners but fortunately none of them was detonated. Saudi militant Ibrahim al-Asiri is one of the nominated people described as a master bomb-maker knowing that he is continually trying to perfect his craft. The new security measures imposed by the American administration are expected to include more intensive scrutiny of electronics and more random pat downs of travelers headed to the U.S. However, Homeland Security Secretary Jeh Johnson says the enhanced security will cause a minimal disruption to travelers Any specific threat was revealed and it was clearly specified that this alert had nothing to do with the upcoming July 4 holiday.