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Hollogne-aux-Pierres is a former Walloon municipality of Belgium, now a section of Grâce-Hollogne.
Map of 4460 Hollogne-aux-Pierres, Belgium
It is in this area that the police, on 30 July 1950, opened fire on the inhabitants of Grâce-Berleur, killing four people. This sad event is the tragic element which led to the end of the Royal Question.
References
Hollogne-aux-Pierres Wikipedia(Text) CC BY-SA