The party of Sri Lanka’s new Marxist-leaning president Anura Kumara Dissanayake has won a majority in parliament, providing a solid mandate for his economic revival program.

Mr Dissanayake’s National People’s Power Party won at least 123 of the 225 seats in parliament, according to partial results released by the Elections Commission.

The Samagi Jana Balawegaya, or United People’s Power Party, led by opposition leader Sajith Premedasa had 31 seats.

Sri Lanka Election
Sri Lankan President Anura Kumara Dissanayake as he leaves after casting his vote during the parliamentary election in (AP/Eranga Jayawardena)

Mr Dissanayake was elected president on September 21 in a rejection of traditional political parties that have governed the island nation since its independence from British rule in 1948.

But he received just 42% of the votes, fuelling questions over his party’s outlook in Thursday’s parliamentary elections.

However, the party received large increases in support less than two months into his presidency.

In a major surprise and a big shift in the country’s electoral landscape, his party won the Jaffna district, the heartland of ethnic Tamils in the north, and many other minority strongholds.

The victory in Jaffna marks a great dent for traditional ethnic Tamil parties that have dominated the politics of the north since independence.

It is also a major shift in the attitude of Tamils, who have long been suspicious of majority ethnic Sinhalese leaders.

Ethnic Tamil rebels fought an unsuccessful civil war from 1983 to 2009 to create a separate homeland, saying they were being marginalised by governments controlled by Sinhalese.

According to conservative UN estimates, more than 100,000 people were killed in the conflict.

Of the 225 seats in parliament, 196 were up for grabs under Sri Lanka’s proportional representative electoral system, which allocates seats in each district among the parties according to the proportion of the votes they get.

The remaining 29 seats, called the national list seats, are allocated to parties and independent groups according to the proportion of the total votes they receive countrywide.