FILE - This Oct. 2008 file photo by Muhammad ud-Deen shows Imam Anwar al-Awlaki in Yemen. A Justice Department document says it is legal for the government to kill U.S. citizens abroad if it believes they are senior al-Qaida leaders continually engaged in operations aimed at killing Americans. (AP Photo/Muhammad ud-Deen, File) ** MANDATORY CREDIT NO SALES **

Associated Press
FILE - This Oct. 2008 file photo by Muhammad ud-Deen shows Imam Anwar al-Awlaki in Yemen. A Justice Department document says it is legal for the government to kill U.S. citizens abroad if it believes they are senior al-Qaida leaders continually engaged in operations aimed at killing Americans. (AP Photo/Muhammad ud-Deen, File)   ** MANDATORY CREDIT  NO SALES **
FILE - This Oct. 2008 file photo by Muhammad ud-Deen shows Imam Anwar al-Awlaki in Yemen. A Justice Department document says it is legal for the government to kill U.S. citizens abroad if it believes they are senior al-Qaida leaders continually engaged in operations aimed at killing Americans. (AP Photo/Muhammad ud-Deen, File) ** MANDATORY CREDIT NO SALES **
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