Sirisena said the majority community must ensure Tamils and Muslims live in harmony in a way that all communities live happily in the country.
Addressing a gathering in Eravur town in Eastern province yesterday, Sirisena said the government is keen on addressing the issues faced by all communities.
Sirisena was elected as president with a large backing of the minorities in the January 2015 election, defeating the incumbent Mahinda Rajapaksa - a majority community favourite.
According to a UN report, up to 40,000 Tamil civilians may have been killed in the final months of the fighting that ended in 2009.
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Sirisena said that the reason for the "northeners" to take up arms was that their basic problems had not been addressed.
He said the country must develop irrespective of regional differences, "be it the south, west north or east, all must have equal facilities for education, health and transport".
His government is contemplating a new constitutional arrangement aimed at addressing the issue of political freedom of the minorities.
The government begun the process for a new Constitution inJanuary this year. It has sought public opinion on the new Constitution, the report of which is to be presented by the end of April.
The new Constitution will replace the current executive president-headed constitution adopted in 1978.