During the second night of Barcelona's Mercè festival, 40.000 young people gathered in Barcelona's Plaça Espanya in a huge illegal party that ended up with 43 injured, 13 of them stabbed with knives or other sharp objects, mostly broken glass. The day before there had already been another illegal party at the same place in which 15,000 took part, but then there were no notable incidents and, therefore, it seems that Barcelona City Council, which is responsible for designing the security operation during the festival - as happens in all cities - was confident it was all under control.