Foreign minister Mangala Samaraweera said that the domestic mechanism with foreign technical expertise to probe into the allegations of war crimes will be in place when next UN Human Rights Council session will meet in Geneva in September.
"All I can say is that we will have a domestic mechanism in place in time when the 30th session of UNHRC commences in September," Samaraweera told media here.
The announcement comes days after US Secretary of State John Kerry during a visit to the island warned Sri Lanka that "true reconciliation" with Tamils will take time, even as he praised the "openness" of the new government in efforts to boost democracy, human rights and reaching out to the minority community.
Kerry had praised President Maithripala Sirisena's new government for reaching out to the Tamil minority after the end of the nearly three-decade of ethnic conflict that claimed more than 100,000 lives.
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The new government is of the view that since Sri Lanka is not a signatory to the Rome statute on international jurisdiction to war crimes, the island would execute justice through its national independent judicial mechanism.
The former Rajapaksa regime was subjected to three successive UNHRC resolutions which called for an international investigation.
Rajapaksa drew international condemnation over his refusal to investigate alleged military abuses. His government had refused to cooperate citing it as an attack on Sri Lanka's sovereignty.
The new government's call for a domestic mechanism rather than an international probe has not found favour with the Tamils.
They claim to have no faith in the domestic investigation based on past experiences going slow on them and producing nothing meaningful.