 The prisoners were mostly from Montoneros organization.Some of them were legally detained at Penitentiary Unit n° 7 in Resistencia, Chaco, while others were brought from prisons in Misiones Province; on 12 December they were all taken to the Resistencia police headquarters, tortured, and locked up in individual cells.A military order to move the prisoners to another prison in Formosa was allegedly received during the night.