Tamil civilians stand behind a barbed-wire fence in the Manik Farm refugee camp located on the outskirts of the northern Sri Lankan town of Vavuniya May 26, 2009. U.N. Secretary-General Ban Ki-moon toured Sri Lanka's largest war displaced persons camp on Saturday during a trip to press for wider humanitarian access and political reconciliation. REUTERS/David Gray (SRI LANKA MILITARY CONFLICT POLITICS SOCIETY)