Anti-immigration party set for election gains as Sweden votes

* Sweden Democrats thrive on fears over immigration, welfare* Neither of the main political blocs seen winning a majority* Strong far-right showing could complicate coalition talksSwedes began voting on Sunday morning in an election dominated by fears over asylum and welfare, with the anti-immigration Sweden Democrats vying to become the biggest party in a country long seen as a bastion of economic stability and liberal values.Far-right parties have made spectacular gains throughout Europe in recent years after a refugee crisis sparked by civil war in Syria and continuing conflicts in Afghanistan and parts of Africa.In Sweden, the influx of 163,000 asylum seekers in 2015 has polarised voters, fractured the cosy political consensus and could give the Sweden Democrats, a party with roots in the neo-Nazi fringe, a veto over which parties form the next government."Traditional parties have failed to respond to the sense of discontent that exists," said Magnus Blomgren, a social scientist at Umea University."That discontent maybe isn't directly related to unemployment or the economy, but simply a loss of faith in the political system. Sweden isn't alone in this."The centre-left bloc, uniting the minority governing Social Democrat and Green parties with the Left Party, is backed by about 40% of voters, recent opinion polls indicate, with a slim lead over the centre-right Alliance bloc.People stand on booths at a polling station in Stockholm. The Sweden Democrats, who want the country to leave the European Union and put a freeze on immigration, have about 17%, up from the 13% they scored in the 2014 vote, opinion polls suggest.But their support was widely underestimated before the previous election and some online surveys give them as much as 25%, a result that would be likely to make them the biggest party, dethroning the Social Democrats for the first time in a century.That could weaken the Swedish crown in the short term, but analysts do not see any long-term effect on markets from the election because economic growth is strong, government coffers are well stocked and there is broad agreement about the thrust of economic policy.Eurosceptic voicesSweden has flirted with populism before. New Democracy, founded by an aristocrat and a record producer, won nearly 7% of the vote in 1991, on the promise of strict immigration policies, cheaper alcohol and free parking, only to crash out of parliament three years later.But if the Sweden Democrats win a quarter of the vote, it would be a sensation in a country described as a "humanitarian superpower" in 2014 by the prime minister of the time, the Moderate party's Fredrik Reinfeldt.It would also make them the biggest populist party in the Nordic region, topping the Danish Peopletarget="_blank"'>Voting stations opened at 0600 GMT and will close at 1800 GMT, with exit polls set be published by Sweden's two main broadcasters. Results from the vote will become clear later in the evening.