Israel has a three-tier court system. At the lowest level are magistrate courts, situated in most cities across the country. Above them are district courts, serving as both appellate courts and courts of first instance; they are situated in five of Israel's six districts. The third and highest tier is the Supreme Court, located in Jerusalem; it serves a dual role as the highest court of appeals and the High Court of Justice. In the latter role, the Supreme Court rules as a court of first instance, allowing individuals, both citizens and non-citizens, to petition against the decisions of state authorities. Although Israel supports the goals of the International Criminal Court, it has not ratified the Rome Statute, citing concerns about the ability of the court to remain free from political impartiality.