Yemeni soldiers stand at a check point at the site of explosion near the U.S. embassy in the capital of San'a, Yemen, Tuesday, March 18, 2008, where a Yemeni guard was killed. An official said the blast came after unknown attackers fired two mortars at a high school next to the American embassy in the downtown San'a district of Sawan. The school is attended mostly by Yemeni students. (AP Photo/Mohammad al-Qadhi)

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