A UN human rights expert on Friday visited Sri Lanka's military-run detention camps where nearly 300,000 war-displaced civilians have been held since the country's civil war ended four months ago. Sulakshani Perera, spokeswoman for the UN's refugee agency said in Colombo that Walter Kaelin, the UN secretary-general's representative for the human rights of internally displaced persons, visited camps in northern Vavuniya and Mannar districts. Kaelin would discuss his observations with government officials before leaving on Sunday. Sri Lanka's government has come under intense pressure from human rights groups and foreign governments to free the ethnic Tamils detained in the camps.<br/><br/>Kaelin is the second senior UN official to visit Sri Lanka in a week to discuss the plight of the displaced. Last week, UN Undersecretary General for Political Affairs B Lynn Pascoe expressed concern over the authorities' slow pace in returning the displaced civilians to their homes.