GENEVA (Reuters) - The United Nations stands ready to support an inquiry into abuses in Sri Lankas civil war, UN High Commissioner for Human Rights Navi Pillay said on Thursday. Addressing the UN Human Rights Council, which last week avoided launching an investigation into the Sri Lankan conflict, the former war crimes judge stressed that reconciliation would be impossible without a full reckoning of transgressions. I believe that accountability is a prerequisite for the attainment of justice and reconciliation for all Sri Lankans and, thus, a foundation for lasting peace, Pillay told the forum. Pillay, who is an ethnic Tamil from South Africa, said the Liberation Tigers of Tamil Eelam (LTTE) and the military both needed to hold responsible for killing and mistreating civilians in the last throes of their 25-year conflict. Her remarks sought to keep up pressure on Sri Lanka in spite of the Human Rights Councils failed attempt to scrutinise the conduct of both sides during and after the 25-year separatist war that Colombo declared over last month. Sri Lankas navy said on Thursday it had intercepted a freighter funded by Tamil Tiger sympathisers bound for formerly rebel-held areas, which reached Sri Lankan waters three weeks after the rebels lost a 25-year war. Navy ships intercepted the Captain Ali, funded by a British-based group that calls itself Mercy Mission to Vanni, 160 km west of the Indian Ocean islands capital and main port, Colombo. Mercy Mission to Vanni had said it was bringing humanitarian supplies to Lanka , but the govt and diplomats said it was a thinly veiled attempt to help the LTTE avoid imminent defeat. We rounded up the ship and its being brought closer to shore for checking. We know that it was coming with no local agent, no details of the cargo and the cargo was loaded by pro-LTTE (people) in the U.K. and France, Navy spokesman Captain Mahesh Karunaratne said.