Party chief M Karunanidhi said President Maithiripala Sirisena had won the elections with the support of ethnic Tamils, who had been promised demilitarisation of Tamil-dominated areas.
However, the traditional Tamil homeland is still under heavy military occupation by 1.6 lakh soldiers, mostly Sinhalese, he said referring to the report by California-based Oakland Institute.
"The report of the Oakland Institute shows that injustice against Tamils has not reduced despite a new President. The rule changed there, but did the scene?" he asked.
In a statement here, Karunanidhi recalled that he had written to Prime Minister Narendra Modi in February this year after Sirisena took over, explaining the need for India's intervention in ensuring the rights of minority Tamils and reiterated his demand.