The ICC has jurisdiction over these crimes in three cases: first, if they took place on the territory of a State Party; second, if they were committed by a national of a State Party; or third, if the crimes were referred to the Prosecutor by the UN Security Council. The ICC may begin an investigation before issuing a warrant if the crimes were referred by the UN Security Council or if a State Party requests an investigation. Otherwise, the Prosecutor must seek authorization from a Pre-Trial Chamber of three judges to begin an investigation "proprio motu" (on its own initiative). The only type of immunity the ICC recognizes is that it cannot prosecute those under 18 when the crime was committed. In particular, no officials – not even a head of state – are immune from prosecution.