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By William Maclean DUBAI (Reuters) - The Islamic State militant group released a video on Tuesday purporting to show the beheading of a second American hostage, journalist Steven Sotloff, raising the stakes in its confrontation with Washington over U.S. A masked figure in the video seen by Reuters also issued a threat against a British hostage, a man the group named as David Haines, and warned governments to back off "this evil alliance of America against the Islamic State".
President Barack Obama ordered about 350 more US troops to Baghdad to protect American diplomatic facilities and staff in the Iraqi capital, the White House said. The Sunni extremist group has declared an Islamic "caliphate" in regions under its control in Iraq and Syria, after it swept through much of the Sunni Arab heartland north of Baghdad and then stormed minority Christian and Yazidi areas. The US has been carrying out air strikes on IS positions in Iraq and already has hundreds of personnel shoring up diplomatic security in Iraq. "The president authorized the Department of Defense to fulfill a Department of State request for approximately 350 additional US military personnel to protect our diplomatic facilities and personnel in Baghdad, Iraq," a White House statement said.