The violence erupted in the Deusto district and city centre after thousands of students had demonstrated peacefully "against fascism" to prevent far-right agitator Vito Quiles from holding a rally outside the University of Deusto. Quiles cancelled the event after police advised against relocating it, a move met with applause from anti-fascist groups and the IAS student union.
Despite the cancellation, young radicals dressed in black began throwing flares and firecrackers, carrying slogans including "Long live military Eta", "Spanish bastards" and "Where is Vito Quiles?". According to internal sources, the Ertzaintza (Basque Country police) were ordered not to intervene initially to avoid further trouble. A handful of municipal police officers monitoring the demonstration near the Ugasko bridge were forced to flee. The rioters set up three burning barricades from overturned containers, burnt a municipal police motorbike, and set fire to half a dozen cars. They also attempted to storm the Ertzaintza police station with stones, chanting slogans against the police.
After about an hour, regional police arrived with a modest contingent that grew in numbers. The rioters continued to overturn and set fire to bins, intimidated journalists, and confronted passersby. One local resident was split open for confronting them. Shops pulled down their shutters. By mid-afternoon, police had identified a group of 20-30 young men wearing balaclavas, gloves and rucksacks. The destruction showed signs of organisation.
Around 9pm, regional security minister Bingen Zupiria reported that "around 20" people had been arrested, many minors.
Institutional reactions were swift. Imanol Pradales said: "It is unacceptable. Enough is enough, we don't want them in this country." The mayor stated that what happened "is not anti-fascism, but pure fascism". María del Río, EH Bildu's municipal spokesperson, said the events were "regrettable" and had overshadowed the "exemplary, peaceful and democratic public response" of the preceding hours. The PNV, PSE, PP and Podemos also condemned the serious incidents.