REPUBLIKA.CO.ID, ZURICH -- The anti-immigration Swiss People's Party (SVP) won the biggest share of the vote in Sunday's national parliamentary election, keeping pressure on Bern to introduce quotas on people moving from the European Union.

Success for the SVP, coupled with gains made by the pro-business Liberal Party (FDP), led political commentators to talk of a "Rechtsrutsch" - a "slide to the right" - in Swiss politics.

Immigration was the central topic for voters amid a rush of asylum seekers from the Middle East and North Africa to Europe.

"The vote was clear," SVP leader Toni Brunner told Swiss television. "The people are worried about mass migration to Europe."