Hundreds of protesters battled police in the heart of Barcelona amid anger over the jailing of Catalan separatist leaders.
Masked protestors were seen blocking areas, damaging police vehicles, setting fire to large garbage bins, ransacking banks and attacking riot police officers with stones, cans and bottles.
Police responded with repeated volleys of foam bullets, smoke grenades, tear gas and water cannons.
The violence followed a largely peaceful demonstration that drew more than half a million people onto the streets of the Catalan capital.
Catalan interior affairs chief Miquel Buch distanced themselves from the riots, claiming "this kind of violence is unprecedented in Catalonia ... these people are not separatists".
Some 128 people have been arrested in the region over the past five days, with Spain's acting interior minister, Fernando Grande-Marlaska, warning that rioters faced up to six years in prison.
Russian attacks damaged energy facilities in Ukraine's Sumy and Dnipropetrovsk regions, President Volodymyr Zelenskyy said on Wednesday, with a drone hitting a power line cutting power to 4,000 people.
Israel announced a major expansion of military operations in Gaza on Wednesday, saying large areas of the enclave would be seized and added to its security zones, accompanied by large-scale evacuation of population.
A fourth US Army soldier, who together with three others went missing in Lithuania last week when their vehicle sank in a peat bog, has been found dead, US and Lithuanian officials said on Tuesday.
The United Nations on Tuesday dismissed as "ridiculous" an assertion by Israel that there was enough food in the Gaza Strip to last for a long period of time, despite the closure of all 25 bakeries supported by the World Food Programme (WFP).
United Nations officials who surveyed earthquake damage in Myanmar urged the global community to ramp up aid before the looming monsoon season worsens already catastrophic conditions, with the death toll at 2,719 and expected to surpass 3,000.
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