"We're now competing against the Social Democrats and Moderates to become the biggest party in the country", he said, dismissing the protesters as "communists".
It would also make them the biggest populist party in the Nordic region, topping the Danish People's Party, which gained 21 per cent in 2015, and would trump the 12.6 per cent for the far-right Alternative for Germany, which swept into the Bundestag past year. Although the country initially welcomed the new arrivals, moods quickly soured amid fears that the wave of people fleeing war and poverty could capsize Sweden's generous social welfare system. During this election, almost all of Sweden's major political parties-including the Social Democrats and the Moderates-agreed that Sweden should massively reduce migrant arrivals until a Europewide immigration and refugee policy could be reached.
An SD flag is seen during a political rally for the Sweden Democrats last week.
This is up from up from 12.9 percent and 49 seats in the 2014 election, the biggest gain by any party in Sweden's parliament, reports Reuters.
"Now we will gain influence in Swedish politics for real", Sweden Democrat Jimmie Akesson told a cheering crowd of supporters as the results came in.
But he would need to overcome decades of acrimony between the two blocs and get support from parties on the centre-right, something they have ruled out.
But some 200,000 votes from Swedes who live overseas, which could tip the balance, were only to be counted Wednesday.
Lofven's governing center-left Social Democrats won the largest share with 28.4% of votes cast, while the center-right Moderates took 19.8%.
However, Stefan Lofven, the Swedish prime minister, will have heaved a sigh of relief at the disappointing result for the nationalist Sweden Democrats, .
Sweden faced political deadlock on Monday after the far-right made gains in legislative elections whose result makes it tough to form a functioning government. For me, when he is saying that immigrants are not welcome to Sweden ... he is trying to spread hate between the people.
So now the hard part: how to form a government.
Many Swedes began to worry about an erosion of "humanitarian values" as the Sweden Democrat party rose in popularity.
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"A strategy that was tried to win back voters from the Sweden Democrats meant that the Social Democrats fell even more", said Bjereld.
The Swedish center-left bloc holds a slim lead over the center-right ahead of Sunday's national election, a survey showed, but both are short of a majority and the anti-immigration Sweden Democrats could yet emerge as the largest single party.
Akesson was jubilant as he addressed supporters a day later, declaring the estimated 14 parliament seats the Social Democrats picked up a victory other parties could not ignore in coalition negotiations.
The election had been watched closely for signs about the extent to which a cascade of anti-immigrant fear could hit even Sweden, which has always been one of Europe's most open nations toward refugees.
The country now faces weeks of uncertainty as both blocs engage in frantic horse-trading to try to form the next government.
Akesson had labelled the vote a choice between immigration and welfare in a campaign that was unusually antagonistic.
But the four-party Alliance rejected his invite, calling on Lofven to step down and make way for them to build a government.
Many voters are also concerned about violence.
Lofven said he would not resign and called for cross-party co-operation.
"He said he was interested in cooperating with the other parties, and wanted to tell the Moderates in particular 'how to govern the country".
The Sweden Democrats, shunned by all the other parties since entering parliament in 2010, have promised to sink any cabinet that refuses to give them a say in policy, particularly on immigration.