Speaking in unusual detail, (Transportation Security Administration chief ) Pistole offered specifics about an underwear bomb devised by a master al Qaeda bomb-maker in Yemen meant to be exploded in an airliner over the United States last year. The plot was foiled thanks to a double-agent inside al Qaeda's Yemen branch. Pistole described the May 2012 bomb as "a next generation device" that was "new and improved in many respects" from the Christmas 2009 bomb. Designed by one of the most wanted terrorists in the world, Ibrahim al-Asiri, the device featured "a new type of explosive that we had never...
