Thousands protested late into Sunday night (March 25) in Barcelona, some clashing with riot police in violent scenes.

In the video, Catalonia police - known as the Mossos d'Esquadra - are pelted with eggs while demonstrators are struck with batons.

Tensions in Catalonia have been heightened after the region's former president, Carles Puigdemont, was arrested on a European warrant following his arrival in Germany from Denmark on earlier on Sunday.