 Complete the following phrase:  In Rome on 23 March 1944, 33 policemen of the Police Regiment Bozen from the German-speaking population of the Italian province of South Tyrol and three Italian civilians were killed by a bomb blast and the subsequent shooting. In response, Hitler approved the recommendation of von Mackensen, who was responsible for the sector including Rome, that ten Italians should be shot for each policeman killed. The task fell to SS Obersturmbannführer Herbert Kappler who, finding there were not enough condemned prisoners available, made up the numbers using Jewish prisoners and civilians taken from the streets. The result was the 