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FILE - This Aug. 10, 2013 file photo shows Yemeni soldiers inspecting a car at a checkpoint on a street leading to the U.S. and British embassies in Sanaa, Yemen. In secretive chat rooms and on encrypted Internet message boards, al-Qaida fighters have been planning and coordinating attacks _ including a threatened if vague plot that U.S. intelligence officials say closed 19 embassies across Africa and the Middle East for more than a week. (AP Photo/Hani Mohammed, File)

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Al-Qaida turning to chat rooms to avoid U.S.

Last week's closure of 19 diplomatic posts shows how terrorists are using secretive chat rooms and encrypted Internet message boards to communicate about attacks.

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