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** THE AP IS UNABLE TO VERIFY THE AUTHENTICITY OF THIS IS IMAGE ** Masked men, including one with a knife, centre, stand behind a man identified as American construction contractor Eugene Armstrong, moments before he was beheaded in Iraq, in this image made from video, Monday Sept. 20, 2004. The militant group led by Jordanian terror mastermind Abu Musab al-Zarqawi claimed responsibility for the slaying and said another hostage, either another American or a Briton held by the group will be killed in 24 hours unless all Muslim women prisoners are released from U.S. military jails in Iraq. (KEYSTONE/AP Photo/APTN/Str) === TV-PICTURE, TV OUT ===