UN chief Ban Ki-moon arrives in Sri Lanka later Friday on a 24-hour mission to press for unrestricted humanitarian access to an estimated 280,000 civilians displaced by the war on Tamil rebels. The secretary general was expected just before midnight ahead of talks Saturday with President Mahinda Rajapakse and Foreign Minister Rohitha Bogollagama, and a tour of a controversial camp set up for fleeing Tamils. The visit follows the routing of the Tamil Tiger rebels -- and the death of their leader Velupillai Prabhakaran -- that ended a bitter decades-long war for a Tamil homeland. Speaking before his departure for the island, Ban said he empathised with "the plight of people trapped by fighting and living in terror and grave hardship." Ban's chief of staff, Vijay Nambiar, told reporters in Colombo that his boss would tour the sprawling Manik Farm area in the northern district of Vavuniya, where most of the people displaced by the recent fighting are housed.