The 23-year-old Nigerian man, Umar Farouk Abdulmutallab, who is charged with trying to blow up a transcontinental flight over Detroit, claimed al-Quaeda leaders in Yemen helped him with the plan. As U.S. officials corroborate his story, the New York Times looks at what the U.S. has already been doing to fight a growing terrorist hub working out of Yemen. The CIA has counterterrorism operatives there. And other U.S. forces are training Yemeni military counterparts. The aid level is more than doubling, with over $70 million in spending earmarked for the Yemen effort over the next 18 months.