It is 11 a.m. on 17 May 1973 and a commemoration ceremony has just been held.
Interior Minister Mariano Rumor has just left the building in his car when a bomb is thrown.
A group of people standing just outside the front door is hit.
Four citizens dead, 52 wounded.
The bomber is 40-year-old Gianfranco Bertoli, an ‘individualist anarchist’.
The attack was actually intended by the extreme right-wing group Ordine Nuovo; Bertoli was an informer for the secret services.
Rumor was the target.