Avinguda Meridiana
On 19 June 1987 , the Basque separatist group ETA planted a bomb in the basement of a Hipercor hypermarket in this avenue that killed 21 people . 
<triplet> a bomb <subj> 19 June 1987 <obj> point in time <subj> ETA <obj> participant <subj> Hipercor <obj> target <subj> 21 <obj> number of deaths