war by the Ustaše on suspicion of supporting the Partisans. Mass killings and concentration camps The Ustaše unleashed a reign of terror in which 80% of the Jews (30,000 victims) in the NDH were killed, as well as practically all the Roma (25,000 victims), and almost 20% of the Serb population (340,000 victims – see: Number of victims). As a military vicar, Stepinac dispensed blessings to the Ustaše armies. Stepinac initially responded to these mass killings with private letters of protest. Thus, on 14 May 1941, Stepinac received word of an Ustaše massacre of Serb villagers at Glina. On the same day, he wrote to Pavelić saying: Just now I received news that the Ustaše in Glina executed without trial and investigation 260 Serbs. I know that the Serbs committed some major crimes in our homeland in these last twenty years. But I consider it my bishop's responsibility to raise my voice and to say that this is not permitted according to Catholic teaching, which is why I ask that you undertake the most urgent measures on the entire territory of the Independent State of Croatia, so that not a single Serb is killed unless it is shown that he committed a crime warranting death. Otherwise, we will not be able to count on the blessing of heaven, without which we must perish. According to Biondich, in the first weeks or even months after the establishment of the NDH, Stepinac may have not known that the atrocities perpetrated by the Ustaše were a key component of their plan. This view supposes that Stepinac considered the atrocities were either spontaneous or the result of so-called "irresponsible elements" who would be held to account by the authorities. His correspondence with Pavelić tends to suggest he did not believe that the Poglavnik would have sanctioned such actions. Although Stepinac was firmly opposed to the idea of Ustaše to establish a concentration camp within the borders of the Đakovo Bishop's domain, the Đakovo concentration camp was established in the deserted flour mill owned by the Diocese of Đakovo on 1 December 1941. On the other hand, Phayer writes, "it is impossible to believe that Stepinac and the Vatican did not know that the Ustasha murders amounted to genocide", given the "repression and terrorism of the Ustasha regime were without parallel in the history of Southeastern Europe". Stepinac clearly knew of the May 1941 Glina