Dollar, stocks slide on renewed Middle East tensions

NEW YORK (Reuters) - The dollar fell and global equity markets backed down from fresh highs on Friday on troubling signs of renewed U.S.-Iranian tensions.The United States said it was imposing additional sanctions on Iran as a result of its missile attack on U.S. troops in Iraq this week, and Washington rebuffed an Iraqi request to pull out the troops.Iraq appears set to bear the brunt of any further violence between its neighbor Iran and the United States, sparked by the U.S. killing of Qassem..