The Acca Larentia massacre was the journalistic name given to a double homicide that occurred in Rome on 7 January 1978. Five teenagers of the youth wing of the Italian Social Movement were ambushed while leaving the local party headquarters, and two of the teens (13 years old and 17 years old) were killed. The killings caused riots that same day, in which another MSI sympathiser was killed in clashes with police. The attack was perpetrated by members of militant far-left groups, though the culprits were never identified.