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The attack drew quick condemnation from Turkey, the U.S., Britain and other nations, and officials from both Turkey and the U.S. pledged to work together to fight terrorism.

It was the second deadly assault on a U.S. diplomatic post in five months.

On Sept. 11, terrorists attacked a U.S. mission in Benghazi, Libya, killing U.S. Ambassador J. Christopher Stevens and three other Americans. The attackers in Libya were suspected to have ties to Islamist extremists, and one is in custody in Egypt.

U.S. diplomatic facilities in Turkey have been targeted previously by terrorists. In 2008, an attack blamed on al Qaeda-affiliated militants outside the U.S. Consulate in Istanbul left three assailants and three policemen dead.