Non-essential U.S. Embassy officials are being urged to leave Yemen after it was revealed that an American woman was among those killed in Wednesday's attack.
The attack killed six Yemeni police and four civilians after suspected al Qaeda-linked insurgents disguised as Yemeni forces bombed the outer wall of the embassy in Sanaa. They then opened fire on Yemeni authorities.
The death of the American woman was confirmed on Thursday by deputy U.S. State Department spokesman Robert Wood. 
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CNN's Diane Ruggiero in Washington and Schams Elwazer and Ben Wedeman in Sanaa contributed to this report.
