Since the death of Osama bin Laden, Yemen has become the hottest front in the war against Al Qaeda. Now, with headlines about a terrorist plot to bomb a U.S.-bound airliner, award-winning reporter Ghaith Abdul-Ahad travels deep into Yemen’s radical heartland. In this first-hand report, FRONTLINE looks at how members of Al Qaeda in the Arabian Peninsula (AQAP) and affiliated militants have seized control of areas in southern Yemen and... see more