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Pro-independence supporters gather near the Spanish government office in Barcelona, Spain, Sunday, March 25, 2018. Grassroots groups both for and against Catalan secession called for protests Sunday in Barcelona after Carles Puigdemont, the fugitive ex-leader of Catalonia and ardent separatist, was arrested Sunday by German police on an international warrant.

Catalan Mossos d'Esquadra regional police officers detain a man during clashes with pro-independence supporters trying to reach the Spanish government office in Barcelona, Spain, Sunday, March 25, 2018. Grassroots groups both for and against Catalan secession called for protests Sunday in Barcelona after Carles Puigdemont, the fugitive ex-leader of Catalonia and ardent separatist, was arrested Sunday by German police on an international warrant.

A protester cries as she speaks to riot police blocking the road leading to the central government offices at a demonstration in Barcelona on March 25, 2018 after Catalonia's former president was arrested by German police. German police arrested Catalonia's deposed leader Carles Puigdemont on March 25, 2018, five months after he went into self-imposed exile in Belgium over his failed bid to break the region away from Spain.

Catalan Mossos d'Esquadra regional police officers block the way to pro-independence supporters trying to reach the Spanish government office in Barcelona, Spain, Sunday, March 25, 2018. Grassroots groups both for and against Catalan secession called for protests Sunday in Barcelona after Carles Puigdemont, the fugitive ex-leader of Catalonia and ardent separatist, was arrested Sunday by German police on an international warrant.

A pro independence demonstrator holds a poster with of a photo of deposed leader of Catalonia's pro-independence party Carles Puigdemont during a protest in Barcelona, Spain, Sunday, March 25, 2018. Puigdemont was arrested Sunday by German police on an international warrant as he tried to enter the country from Denmark.

Pro independence demonstrators march during a protest in support of Catalonian politicians who have been jailed on charges of sedition in Barcelona, Spain, Sunday, March 25, 2018. Puigdemont was arrested Sunday by German police on an international warrant as he tried to enter the country from Denmark.

Tourists look out from Antoni Gaud铆's Casa Batllo building at a Pro independence demonstration march in support of Catalonian politicians who have been jailed on charges of sedition and the detention of deposed leader of Catalonia's pro-independence party Carles Puigdemont in Barcelona, Spain, Sunday, March 25, 2018. Puigdemont was arrested Sunday by German police on an international warrant as he tried to enter the country from Denmark.

Catalan Mossos d'Esquadra regional police officers block the way to protestors, holding pro-independence and republican flags, trying to reach the Spanish government office in Barcelona, Spain, Sunday, March 25, 2018. Grassroots groups both for and against Catalan secession called for protests Sunday in Barcelona after Carles Puigdemont, the fugitive ex-leader of Catalonia and ardent separatist, was arrested Sunday by German police on an international warrant.

Egg stains, tomatoes and cans cover the ground as riot police block the road leading to the central government offices following scuffles during a demonstration in Barcelona on March 25, 2018 after Catalonia's former president was arrested by German police. German police arrested Catalonia's deposed leader Carles Puigdemont on March 25, 2018, five months after he went into self-imposed exile in Belgium over his failed bid to break the region away from Spain.

Yellow paint, allegedly thrown by protestors, stains the uniform of a Catalan Mossos d'Esquadra regional police officer blocking the way of pro-independence supporters trying to reach the Spanish government office in Barcelona, Spain, Sunday, March 25, 2018. Grassroots groups both for and against Catalan secession called for protests Sunday in Barcelona after Carles Puigdemont, the fugitive ex-leader of Catalonia and ardent separatist, was arrested Sunday by German police on an international warrant.

Protesters scuffle with riot police blocking the road leading to the central government offices at a demonstration in Barcelona on March 25, 2018 after Catalonia's former president was arrested by German police. German police arrested Catalonia's deposed leader Carles Puigdemont on March 25, 2018, five months after he went into self-imposed exile in Belgium over his failed bid to break the region away from Spain.

Protesters clash with riot police blocking the road leading to the central government offices during a demonstration in Barcelona on March 25, 2018 after Catalonia's former president was arrested by German police. German police arrested Catalonia's deposed leader Carles Puigdemont on March 25, 2018, five months after he went into self-imposed exile in Belgium over his failed bid to break the region away from Spain.

Protesters scuffle with riot police blocking the road leading to the central government offices at a demonstration in Barcelona on March 25, 2018 after Catalonia's former president was arrested by German police. German police arrested Catalonia's deposed leader Carles Puigdemont on March 25, 2018, five months after he went into self-imposed exile in Belgium over his failed bid to break the region away from Spain.

Catalan Mossos d'Esquadra regional police officers clash with pro-independence supporters trying to reach the Spanish government office in Barcelona, Spain, Sunday, March 25, 2018. Grassroots groups both for and against Catalan secession called for protests Sunday in Barcelona after Carles Puigdemont, the fugitive ex-leader of Catalonia and ardent separatist, was arrested Sunday by German police on an international warrant.

Protesters clash with riot police blocking the road leading to the central government offices during a demonstration in Barcelona on March 25, 2018 after Catalonia's former president was arrested by German police. German police arrested Catalonia's deposed leader Carles Puigdemont on March 25, 2018, five months after he went into self-imposed exile in Belgium over his failed bid to break the region away from Spain.

Riot police stand guard after a smoke bomb was thrown during scuffles between protesters and police blocking the road leading to the central government offices during a demonstration in Barcelona on March 25, 2018 after Catalonia's former president was arrested by German police. German police arrested Catalonia's deposed leader Carles Puigdemont on March 25, 2018, five months after he went into self-imposed exile in Belgium over his failed bid to break the region away from Spain.

A demonstrator stands in front of a police cordon with a banner showing jailed separatist leaders Jordi Sanchez and Jordi Cuixart and reading "Freedom to political prisoners" during a protest called by pro-independence movements in Barcelona on March 23, 2018. Five Catalan separatists were placed in custody by the judge investigating the region's breakaway bid, the Supreme Court said. Catalonia remains under direct rule from Madrid, which was imposed after the region declared independence in October.

Demonstrators stand opposite riot police officers while waving Catalan pro-independence Estelada flags during a protest called by pro-independence movements in Barcelona on March 23, 2018. Five Catalan separatists were placed in custody by the judge investigating the region's breakaway bid, the Supreme Court said. Catalonia remains under direct rule from Madrid, which was imposed after the region declared independence in October.

Pro-independence supporters gather near the Spanish government office in Barcelona, Spain, Sunday, March 25, 2018. Grassroots groups both for and against Catalan secession called for protests Sunday in Barcelona after Carles Puigdemont, the fugitive ex-leader of Catalonia and ardent separatist, was arrested Sunday by German police on an international warrant.

A man with a red plastic clown's nose stands in front of two Catalan Mossos d'Esquadra regional police officers in riot gear during a protest over the detention of deposed leader of Catalonia's pro-independence party Carles Puigdemont in Barcelona, Spain, Sunday, March 25, 2018. Puigdemont was arrested Sunday by German police on an international warrant as he tried to enter the country from Denmark.

A woman protects a man who was accused by some protesters of being an infiltrated police officer during a pro-independence protest near the Spanish government office in Barcelona, Spain, Sunday, March 25, 2018. Grassroots groups both for and against Catalan secession called for protests Sunday in Barcelona after Carles Puigdemont, the fugitive ex-leader of Catalonia and ardent separatist, was arrested Sunday by German police on an international warrant.

Protestors attack a van of the Catalan Mossos d'Esquadra regional police blocking the way of pro-independence supporters trying to reach the Spanish government office in Barcelona, Spain, Sunday, March 25, 2018. Grassroots groups both for and against Catalan secession called for protests Sunday in Barcelona after Carles Puigdemont, the fugitive ex-leader of Catalonia and ardent separatist, was arrested Sunday by German police on an international warrant.

A riot police officer takes position during clashes with protesters in Barcelona on March 25, 2018 after Catalonia's former president was arrested by German police. German police arrested Catalonia's deposed leader Carles Puigdemont on March 25, 2018, five months after he went into self-imposed exile in Belgium over his failed bid to break the region away from Spain.

Protesters hold on to crowd control barricades during clashes between riot police and demonstrators in Barcelona on March 25, 2018 after Catalonia's former president was arrested by German police. German police arrested Catalonia's deposed leader Carles Puigdemont on March 25, 2018, five months after he went into self-imposed exile in Belgium over his failed bid to break the region away from Spain.

Catalan Mossos d'Esquadra regional police officers run by a police van after metal raining were thrown during a protest after the detention of deposed leader of Catalonia's pro-independence party Carles Puigdemont in Barcelona, Spain, Sunday, March 25, 2018. Puigdemont was arrested Sunday by German police on an international warrant as he tried to enter the country from Denmark. (AP Photo/Manu Fernandez)

Protesters clash with riot police blocking the road leading to the central government offices during a demonstration in Barcelona on March 25, 2018 after Catalonia's former president was arrested by German police. German police arrested Catalonia's deposed leader Carles Puigdemont on March 25, 2018, five months after he went into self-imposed exile in Belgium over his failed bid to break the region away from Spain.

Paramedics transport an injured protester following clashes between protesters and riot police blocking the road leading to the central government offices during a demonstration in Barcelona on March 25, 2018 after Catalonia's former president was arrested by German police. German police arrested Catalonia's deposed leader Carles Puigdemont on March 25, 2018, five months after he went into self-imposed exile in Belgium over his failed bid to break the region away from Spain.

A protester gestures as he walks past riot police officers during clashes at a demonstration in Barcelona on March 25, 2018 after Catalonia's former president was arrested by German police. German police arrested Catalonia's deposed leader Carles Puigdemont on March 25, 2018, five months after he went into self-imposed exile in Belgium over his failed bid to break the region away from Spain. / AFP PHOTO / LLUIS GENELLUIS GENE/AFP/Getty Images