Thousands of demonstrators gathered in the western German city of Giessen on Saturday as the far-right Alternative for Germany’s new youth organization was set to kick off its founding convention.

Groups of protesters blocked or tried to block roads in and around the city of some 93,000 people in the early morning. Police said they used pepper spray after stones were thrown at officers at one location.

The new youth organization of the anti-immigration Alternative for Germany, or AfD, is to be set up in a meeting at Giessen’s convention center. Its predecessor, the Young Alternative — a largely autonomous group with relatively loose links to the party — was dissolved at the end of March after AfD decided to formally cut ties with it.

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