Stuttgart, Germany (BBN)-Hundreds of left-wing demonstrators have tried to block people entering a far-right party conference in the German city of Stuttgart.
The Alternative fur Deutschland (AfD) party is expected to re-brand itself as openly anti-Islamic during the meeting, reports BBC.
Police, who surrounded several hundred protesters, fired pepper spray at crowds.
Close to 1,000 officers were deployed.
The AfD wants to ban the burqa and outlaw minarets in Germany.
Despite the protest, the conference began as planned on Saturday morning.
Nearly 2,000 members of the AfD are registered to attend the conference.
The party achieved gains in all three states taking part in regional elections last month, claiming almost a quarter of the vote in the relatively poor eastern state of Saxony-Anhalt.
It had campaigned against what it called Chancellor Angela Merkel's "catastrophic" decision to accept a million migrants and refugees in 2015.
In Saturday's conference, the party must agree a manifesto ahead of next year's general election.
Proposals include withdrawal from the euro and the reintroduction of conscription, but there are splits within the party, including between its less hardline wing and the leadership.
Before the conference, police encircled groups of demonstrators in a technique known as kettling.
Some protesters were seen being dragged away, with others chanting 'Shame on you' at officers.
Police did not say how many people were arrested.
More on AfD
Founded in 2013 by Bernd Lucke, Alexander Gauland and Konrad Adam to oppose German-backed bailouts for poorer southern European countries
Mr Lucke, seen as a moderate, wanted Germany out of the euro but his colleagues were unhappy that he wanted to focus exclusively on euro-related issues
He quit the party in early July 2015, arguing it was becoming increasingly xenophobic
Right-winger Frauke Petry replaced him as party leader
It became the first anti-euro party to win seats in a German regional parliament, receiving almost 10 per cent of the vote in the eastern German state of Saxony in 2014, and went on to win seats in four other states' parliaments in 2014 and 2015
The party had seven MEPs elected in the 2014 European elections (including Mr Lucke), but only two remain party members
AfD was part of the European Conservatives and Reformists Group, like the UK's ruling Conservatives, but its two MEPs look set to be expelled from the group over comments on shooting refugees
BBN/SK/AD