This just in... Iraqi militants have apparently beheaded a U.S.civilian in retaliation for U.S. abuse of Iraqi prisoners. For news 24 hours a day, log on to www.cbsnews.com In other developments: A video posted Tuesday on an Islamic militant Web site appeared to show a group affiliated with al Qaeda beheading an American in Iraq, saying the death was revenge for the prisoner-abuse scandal. The video showed five men wearing headscarves and black ski masks, standing over a bound man in an orange jumpsuit who identified himself as an American from Philadelphia. After reading a statement, the men were seen pulling the man to his side and cutting off his head with a large knife. They then held the head out before the camera.