At least 140 people have been arrested in Slovakia’s capital, where thousands gathered for an anti-immigration and anti-Islamization rally, according to local media reports. The march turned violent as protesters scuffled with police.

The march was organized by the Alternativna cesta group via Facebook. It was called to protest against Brussels’ proposal to tackle the influx of migrants to the EU by imposing compulsory national quotas that require EU countries to accept a specific number of new migrants, most of whom arrived in Italy or Greece.

Slovak media say the march drew thousands of protesters, while the Facebook page for the event claims that about 14,000 people took part in the rally.

The activists, who said they are against the ‘Islamization of Europe’ and migrants from the Middle East and Africa, were chanting slogans like “Slovakia to Slovaks,” “Stop Islamization in Europe; Together Against dictate of Brussels; Europe for Europeans!”

Some of the banners read “Slovakia is not Africa.”