Sri Lankan Tamil politician Gajen Ponnambalam in a tweet said that a "Tamil Genocide Remembrance" event organised by his Tamil National People's Front (TNPF) scheduled for May 18 has been banned on the orders of the Mullaithivu magistrate.
Ponnambalam said the police told him that another organisation wants to commemorate the same event in Mullaithivu so it might trigger a clash causing a breach of peace.
Tamils claim tens of thousands died in the final battle which the UN had estimated to be around 40,000.
Sri Lanka however has denied the number of deaths claimed by Tamil groups.
Separately, the government is set to celebrate May 18 this year as 'Armed Forces Day' with lesser focus on glorifying the military victory, keeping in mind the sensitivities of the Tamil minority.
In a related development, the Transnational Government of Tamil Eelam (TGTE) says that they would keep up the pressure on President Maithripala Sirisena's government on the Tamil issue in the island.