82 190. It should be noted that this notion is spelled out in the Secretary General’s Report, according to which: The Secretary-General believes that all persons who participate in the planning, preparation or execution of serious violations of international humanitarian law in the former Yugoslavia are individually responsible for such violations.232 Thus, all those who have engaged in serious violations of international humanitarian law, whatever the manner in which they may have perpetrated, or participated in the perpetration of those violations, must be brought to justice. If this is so, it is fair to conclude that the Statute does not confine itself to providing for jurisdiction over those persons who plan, instigate, order, physically perpetrate a crime or otherwise aid and abet in its planning, preparation or execution. The Statute does not stop there. It does not exclude those modes of participating in the commission of crimes which occur where several persons having a common purpose embark on criminal activity that is then carried out either jointly or by some members of this plurality of persons. Whoever contributes to the commission of crimes by the group of persons or some members of the group, in execution of a common criminal purpose, may be held to be criminally liable, subject to certain conditions, which are specified below. 191. The above interpretation is not only dictated by the object and purpose of the Statute but is also warranted by the very nature of many international crimes which are committed most commonly in wartime situations. Most of the time these crimes do not result from the criminal propensity of single individuals but constitute manifestations of collective criminality: the crimes are often carried out by groups of individuals acting in pursuance of a common criminal design. Although only some members of the group may physically perpetrate the criminal act (murder, extermination, wanton destruction of cities, towns or villages, etc.), the participation and contribution of the other members of the group is often vital in facilitating the commission of the offence in question. It follows that the moral gravity of such participation is often no less – or indeed no different – from that of those actually carrying out the acts in question. 192. Under these circumstances, to hold criminally liable as a perpetrator only the person who materially performs the criminal act would disregard the role as co-perpetrators of all 232 Ibid., para 54 (emphasis added). Case No.: -94-1-A 15 July 1999