In an Internet statement, the militant group al-Qaida in Iraq claimed responsibility for killing two U.S. soldiers. Terrorism experts discuss the tactics and leadership of insurgents in Iraq.
Ayman al-Zawahiri, al-Qaida's second-in-command, said in a videotape broadcast Thursday that attacks against Britain and the United States would not stop until British and American troops withdrew from Iraq and other Muslim nations.
By PBS NewsHour
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