© Domingos Oliveira / RTL
Luxembourg's association of prison officers confirmed six officers had been attacked on Wednesday evening at the Schrassig penitentiary.
The six officers were described as having been victims of an armed attack on Wednesday evening. Further details were not disclosed by the association.
In a statement, the association said there had been a noticeable increase in attacks and threats made against personnel over the last few weeks. The association added that the threats would be taken very seriously.