The Primavalle Fire (Rogo di Primavalle in Italian) was an arson which occurred in Rome on 16 April 1973, and which caused the death of two youngsters, children of neo-fascist Movimento Sociale Italiano (MSI) member Mario Mattei.The fire was caused by the far left terrorist group Potere Operaio, who, during the night, threw an inflammable substance on the door of the house of Mattei, in the quarter of Primavalle.