Mangala Samaraweera said the contours of a domestic investigative mechanism will be finalised in time for the September UN Human Rights Council sessions in Geneva when Sri Lanka's rights record will beunder the microscope.
President Maithripala Sirisena had earlier said that an domestic mechanism to look into allegations that up to 40,000 Tamil civilians were killed in the final phase of the island's separatist war would be ready by this month (June).
He said the government had expected the current parliament to be dissolved by April, but there had been delays in getting work done through the legislature where the government does not enjoy a majority and must depend on opposition support.
The minister also suggested that the current parliament which the new president inherited from his predecessor Mahinda Rajapaksa could be dissolved, as early as tonight clearing the way for an election by late August.
Sri Lanka is under intense pressure to probe allegations that up to 40,000 ethnic Tamils were killed by troops led by former leader Rajapaksa in the final months of fighting which ended by May 2009.