The accuracy of these numbers is challenged: the OTP noted that although Ivanišević's book estimated that around 1,200 Serbs were killed, personal details were only available for 624 victims. The validity of labeling some of the casualties as "victims" is also challenged: studies have found a significant majority of military casualties compared to civilian casualties. This is in line with the nature of the conflict—Serb casualties died in raids by Bosniak forces on outlying villages used as military outposts for attacks on Srebrenica (many of which had been ethnically cleansed of their Bosniak majority population in 1992). For example, the village of Kravica was attacked by Bosniak forces on Orthodox Christmas Day, 7 January 1993. Some Serb sources such as Ivanišević allege that the village's 353 inhabitants were "virtually completely destroyed". In fact, the VRS' own internal records state that 46 Serbs died in the Kravica attack: 35 soldiers and 11 civilians, while the ICTY Prosecutor's Office's investigation of casualties on 7 and 8 January in Kravica and the surrounding villages found that 43 people were killed, of whom 13 were obviously civilians. Nevertheless, the event continues to be cited by Serb sources as the key example of crimes committed by Bosniak forces around Srebrenica. As for the destruction and casualties in the villages of Kravica, Šiljković, Bjelovac, Fakovići and Sikirić, the judgement states that the prosecution failed to present convincing evidence that the Bosnian forces were responsible for them, because the Serb forces used artillery in the fighting in those villages. In the case of the village of Bjelovac, Serbs even used warplanes.