The Christmas Day attack on an American jetliner is forcing intelligence agencies to reassess their views of al-Qaida's capabilities. Officials previously viewed al-Qaida groups in Yemen, Iraq and Africa mainly as threats to U.S. interests abroad. But the Yemeni branch, known as al-Qaida in the Arabian Peninsula, has now struck in the U.S. homeland, raising the likelihood of broader military counter-terrorism efforts in the region.

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