Responsibility for the attack was claimed a few days afterward through an audio tape discovered next to a petrol station, in which a garbled young voice said the following on behalf of the Nuclei Armati di Contropotere Territoriale (Armed Groups of Territorial Counterpower): .
« An armed nucleus, after skillfully gathering information and controlling the sewer (referring to the MSI Party headquarters) in Acca Larentia, hit the black rats in the exact moment in which they were leaving to go on with another violent action.