After Felipe González's victory, the Grupos Antiterroristas de Liberación (GAL), death squads established by officials belonging to the Spanish government, were created. Using state terrorism, the GAL carried out dozens of attacks around the Basque Country, killing 27 people. It targeted ETA and Herri Batasuna members, although sometimes civilians were also killed. The GAL were active from 1983 until 1987, a period referred to as the Spanish Dirty War. ETA responded to the dirty war by intensifying its attacks. These included the Plaza República Dominicana bombing in Madrid - which killed 12 police officers, the Hipercor bombing in Barcelona - which killed 21 civilians and the Zaragoza barracks bombing - which killed 11 people. After the Hipercor bombing, most of the Spanish and Basque political parties signed many pacts against ETA, such as the "Madrid pact" or the "Ajuria-Enea pact". It was during this time that Herri Batasuna got its best results: it was the most voted party in the Basque autonomous community for the European Parliament elections.