Sri Lankan para-military Special Task Force Commandos stand guard outside the United Nations office in Colombo on August 26, 2013, during a demonstration by 'Power of Ravana' Buddhist monks denouncing UN human rights chief Navi Pillay on the first full day of her visit to Sri Lanka. The UN's top rights official began her visit to Sri Lanka on August 25, by brushing aside criticism that she overstepped her brief and vowing to raise human rights concerns with Colombo