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Members of an Islamist group hold placards outside the U.S. embassy in London on September 11, 2011 during a ceremony to mark the 10th anniversary of the 9/11 attacks on the United States (Credit: Reuters/Paul Hackett)

Members of an Islamist group hold placards outside the U.S. embassy in London on September 11, 2011 during a ceremony to mark the 10th anniversary of the 9/11 attacks on the United States (Credit: Reuters/Paul Hackett)