Basque separatist group ETA commits one of its most violent attacks, in which a bomb is set off in a supermarket, Hipercor, killing 21 and injuring 45.

ETA, an acronym for Euskadi Ta Askatasuna, was an armed Basque nationalist and separatist organization active in Spain and France between 1959 and 2018. It was founded in 1959, during Francoist Spain, by a group of Basque nationalist students seeking to promote Basque identity and independence.…