In Iraq, six worshippers have been killed and twenty-five others wounded in a series of attacks of mortar shells and bombs in different parts of Baghdad. <br/><br/>Tens of thousands of worshippers are expected in Baghdad for attending a religious celebration that will peak today and tomorrow at the mausoleum of Musa Kazim. <br/><br/>Meanwhile, A top US commander in Iraq has warned that there may be a need for positioning UN peace keeping force in Iraq after US troops pull out.