Addressing a ceremony held at Vellamullivaikkal in the northeastern Mullaithivu district to mark the seventh death anniversary of the civilians who died during the civil war, Wigneswaran said, "Not everyone who died during the war was a terrorist. We are here to commemorate the civilians. It is necessary to seek out what happened to these people since a lot of civilians lost their lives due to the war."
A five-minute silence was observed in memory of the victims as well as religious observances.
A similar commemoration was also held in the Jaffna University.
The government has banned the commemoration of the fallen LTTE cadres in the conflict. The LTTE remains a banned terrorist organisation in Sri Lanka.
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Government forces killed the Tamil Tiger rebel leader Velupillai Prabhakaran on May 18, 2009 after a brutal military crackdown, and declared an end to the 37-year conflict which claimed at least 100,000 lives.
The new government has abandoned a controversial military "victory" parade for a more sombre remembrance ceremony to mark the day.
Earlier, parades celebrated the victory of the Sinhalese military over the minority Tamils, who were banned from remembering their dead as commemoration of fallen rebels was thought anti-state.