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.
Israel reopened the border between Gaza and Egypt on Monday for people on foot, a move that would allow Palestinians to leave the enclave and let back in those who want to return after fleeing Israel's war in the enclave.
At least 12 people were killed and seven wounded after a Russian drone struck a bus carrying miners in Ukraine's southeastern Dnipropetrovsk region, energy firm DTEK and government officials said on Sunday.
Five-year-old Liam Conejo Ramos and his father have returned to their home in a Minneapolis suburb after being detained by US immigration officers and held at a detention facility in Texas, a lawmaker said on Sunday.
Gaza's main border crossing in Rafah will reopen for Palestinians on Monday, Israel said, with preparations underway at the war-ravaged enclave's main gateway that has been largely shut for almost two years.
Nearly 90 people have died in bitter cold affecting areas of the United States from Texas to New Jersey, according to media reports citing local authorities.
Pakistan's security forces killed 145 militants over 40 hours after coordinated attacks across Balochistan, the chief minister of the southwestern province said on Sunday, as the authorities battle one of the deadliest flare-ups in years.
Israel carried out its heaviest airstrikes in Gaza in weeks on Saturday, killing 26 people according to local health authorities, in attacks on a Hamas-run police station and on apartments and tents in an area sheltering displaced Palestinians.
The US government entered what is expected to be a brief shutdown on Saturday after Congress failed to approve a deal to keep a wide swath of operations funded ahead of a midnight deadline.
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Israel reopens Gaza's Rafah border crossing to Egypt, with limits
Russian drone strike kills 12 miners in Ukraine
Five-year-old boy returns to Minnesota after ICE release
Reopening of Gaza's Rafah crossing expected Monday
Winter storm death toll in United States reaches 90
Pakistan says 145 militants killed after attacks in Balochistan
Israeli strikes kill 26 in Gaza, health officials say
US government starts likely brief shutdown as House fails to approve deal
