More than 1,000 people were protesting outside a far-right political party in Stuttgart
Demonstrators tried to block entrances and things got violent, police said
Five hundred people were arrested in Germany after violent clashes broke out, authorities said.
More than 1,000 people were protesting Saturday in Stuttgart, where Alternative for Germany, a far-right political party, is holding a two-day conference over the weekend.
Demonstrators tried to block party members from entering the building where their conference was taking place.
Protesters then clashed with police, throwing flares and setting tires on fire, according to Richard Leuze, the spokesman for Reutlingen police.
About 2,000 party members were trying to attend the conference.
Another smaller, peaceful demonstration in the southern German city drew about 800 people.
More protests are expected Sunday during the convention’s second day.
CNN’s Joshua Berlinger contributed to this report