 In May 2007, after as many as 51 Afghan civilians were killed in a bombing, Karzai asserted that his government "can no longer accept" casualties caused by U.S. and NATO operations.In September 2006, Karzai told the United Nations General Assembly that Afghanistan has become the "worst victim" of terrorism.Karzai said terrorism is rebounding in his country, with militants infiltrating the borders to wage attacks on civilians.