Protesters try to block access to the party congress of right-wing populist party "Alternative Fuer Deutschland" (Alternative for Germany) in Stuttgart on April 30, 2016Protesters try to block access to the party congress of right-wing populist party "Alternative Fuer Deutschland" (Alternative for Germany) in Stuttgart on April 30, 2016 (AFP Photo/Philipp Guelland)
Stuttgart (Germany) (AFP) - German riot police on Saturday briefly detained some 500 protesters as clashes erupted outside a meeting of the right-wing populist AfD party, which is set to adopt an anti-Islamic manifesto amid a rise in European anti-migrant groups.
Left-wing demonstrators burned tyres and threw firecrackers as they tried to disrupt the start of the Alternative for Germany (AfD) party's weekend congress in the western city of Stuttgart.
The AfD gathering comes a week after the far-right Freedom Party's Norbert Hofer sent shock waves through Austria's political establishment by winning the first round of a presidential ballot.
Heavily-armoured riot police used tear gas to hold off protesters, many dressed in black and masking their faces, as officers escorted AfD members into the congress hall.
"No rights for Nazi propaganda," cried one group of protesters, who threw firecrackers at journalists and over 1,000 riot police deployed.
The clashes delayed the opening of the congress by more than an hour.
Stuttgart police said on Twitter that the more than 500 people taken into custody were later released "in small groups".
Three officers were lightly wounded in the hours-long scuffles but there were no reports of injuries among the demonstrators, it added in a statement.
Now polling around 14 percent, AfD is eyeing entry into the federal parliament in elections next year after a string of state election wins.
The AfD was formed only three years ago and has since gradually shifted its policies to the right, while entering half of Germany's 16 state legislatures and the European parliament.
Having initially railed against bailouts for debt-hit eurozone economies, it has changed focus to protest against mostly-Muslim migrants and refugees, more than a million of whom sought asylum in Germany last year.
The AfD has loudly protested against Chancellor Angela Merkel's liberal migration policy but also channelled popular anger against established political parties and the mainstream press.
- Call to ban minarets -
Around 2,400 AfD members were expected at the congress, which comes after deputy leader and European parliament member Beatrix von Storch last week caused anger by labelling Islam a "political ideology that is incompatible with the German constitution".
Von Storch said the congress would call for a ban on Islamic symbols in Germany such as minarets on mosques, the call to prayer and full-face veils for women.
It will openly challenge Merkel's claim that "Islam is part of Germany", a country that is home to around four million Muslims.
Aiman Mazyek, chairman of the Central Council of Muslims in Germany, said it was "the first time since Hitler's Germany that there is a party which discredits and existentially threatens an entire religious community".
The challenge for the AfD is that the sharply reduced migrant influx of recent months has deprived it of its core issue.
Unlike in some other European countries, the AfD cannot bank on widespread discontent in Germany, where unemployment is low and the public still trust the government "more than elsewhere", said Timo Lochocki of think-tank the German Marshall Fund in Berlin.
Nonetheless, shifting more openly to anti-Islam rhetoric "may well carry the AfD" into parliament in 2017, said political scientist Nele Wissmann.
A study by the Bertelsmann Foundation think-tank last year found that 57 percent of Germans view Islam as a "threat" and that 61 percent felt that the religion is "inconsistent with the Western world", a level of distrust that is "hard to ignore", said Wissmann.
The AfD was founded at the height of the eurozone crisis by economics professor Bernd Lucke, calling for Germany to leave the euro and return to the Deutschmark.
However, a more hardline right-wing and nationalist faction, led by Frauke Petry, last year deposed Lucke, with particular support in eastern Germany.
The party has not yet decided whether it will team up in the European parliament with France's National Front of Marine Le Pen, but AfD ME Marcus Pretzell announced Saturday that he was joining the Le Pen-led grouping in the Strasbourg chamber.