WATCH: Over 70 Injured as Barcelona Protests Turn Violent

After the Spanish Supreme Court issued a European arrest warrant for Puigdemont last Friday, the popular Catalan leader was detained on Sunday in Germany after evading arrest in Finland. Puigdemont, facing up to 25 years in prison, is accused of rebellion and sedition, after leading what Madrid decried as an illegal pro-independence referendum in late 2017. Several colleagues have also been jailed and face trial.

Clashes with police in Barcelona and many other cities have seen some 79 injured as rioters threw rocks and pelted security forces with objects at hand.

Wielding batons, Spanish riot police engaged with angry crowds in attempts to prevent protesters from approaching offices housing representatives of the central Spanish government.

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There were reports of police beating marchers and firing weapons above the heads of the crowd as a means to disperse the mass while protesters threw eggs, cans and glass at the heavily-armed forces.

Some 79 people — including 13 riot police — have been injured, according to reports by the Catalan capital's emergency services.

The escalating violence saw Catalan parliament speaker Roger Torrent take to regional television to appeal for calm.