ETA performed their first car bomb assassination in Madrid in September 1985 , resulting in one death ( American citizen Eugene Kent Brown , Johnson & Johnson employee ) and sixteen injuries ; the Plaza República Dominicana bombing in July 1986 killed 12 members of the Guardia Civil and injured 50 ; on 19 June 1987 , the Hipercor bombing was an attack in a shopping center in Barcelona , killing twenty-one and injuring forty-five ; in the last case , entire families were killed . The horror caused then was so striking that ETA felt compelled to issue a communiqué stating that they had given warning of the Hipercor bomb , but that the police had declined to evacuate the area . The police claim that the warning came only a few minutes before the bomb exploded
Plaza República Dominicana bombing
Plaza República Dominicana bombing
ETA (separatist group)