"We are opposed to any international inquiry. That has been our position," Tissa Attanayake, the UNP general secretary said.
The main opposition response came at the conclusion of the Commonwealth Heads of Governments Meeting (CHOGM) yesterday.
British Prime Minister David Cameron, on the sidelines of the summit, had warned Sri Lanka that his government would work with the UN Human Rights Council to set up an international inquiry if the country failed to address rights concerns by March next year.
Attanayake said Sri Lanka's own international mechanism, Lessons Learnt and Reconciliation Commission (LLRC) would be adequate to deal with the allegations.
Sri Lankan troops were accused of committing human rights violations during the final phase of the conflict against the LTTE.
Sri Lanka maintains it is unfair for the international community to press for an inquiry on the last 4 months of the conflict when the island had suffered from the brutal terrorist campaign of the LTTE for 30 years.
Attanayake, however, blamed the government for becoming a party to the CHOGM declaration where the leaders had agreed to an international court on human rights.
