If indeed al-Qaeda's base is now in Yemen, we're facing a whole new dynamic. Yemen's well-armed and notoriously independent tribes are even less likely than those of Pakistan to stand for a sustained aerial campaign against the militants. Angered, the tribes can be all but counted on to move on Yemen's capital Sana'a and other major cities, dragging the country into a full-fledged civil war. Or they will increase their attacks on America's ally, Saudi Arabia.
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