Violence flared in Barcelona as angry Catalans protested against the detention of fugitive former leader Carles Puigdemont in Germany.
Police dressed in riot gear were striking demonstrators with batons as they tried to push back a large crowd advancing on the office of the Spanish government’s representative in Catalonia.
Catalan police blocked the street and issued a call for people not to gather.
Thousands answered the call by a pro-independence grassroots group to protest in the city centre hours after Mr Puigdemont was detained by German police.
Prosecutors in Germany said Mr Puigdemont will appear in court on Monday.
The Schleswig prosecutor’s office said “the question of whether Mr Puigdemont has to be taken into extradition custody, will then have to be determined by the higher regional court in Schleswig”.
It said the court will check, based on extradition documents by Spain, if the handover of Mr Puigdemont to Spanish authorities is “legally permissible”.
A Spanish Supreme Court judge charged 13 Catalan separatist politicians with rebellion on Friday for their attempts to make the region independent of Spain, dealing a heavy blow to the secessionist movement.
Spain said its intelligence services and police worked with German police to orchestrate the arrest.
Mr Puigdemont was detained while travelling from Finland back to Belgium, where he has been living since October.