"There were numerous attacks against security forces," police tweeted while media broadcast images of projectiles and fireworks thrown at police who had established a security cordon near the city's main train station.The crowd in the eastern German town was estimated to number around 20,000 and German media reported that some of those who clashed with police were members of far-right groups.
Police ordered the demonstrators several times to respect a distance of 1.5 metres from each other and to wear protective masks.
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