As reported by La Razón, unidentified persons broke open the front door and carried a safe.
Currently, police are investigating surveillance video recordings.
The Francisco Franco Foundation holds numerous documents, some of which, according to Spanish media, are secret.
The reign of Franco, accompanied by brutal repression against opponents of the regime, lasted in Spain from 1939 to 1975. After the death of Franco, the Spanish authorities announced an amnesty regarding the activities of representatives of his regime.