Jordan's law enforcement is under the purview of the Public Security Directorate (which includes approximately 50,000 persons) and the General Directorate of Gendarmerie, both of which are subordinate to the country's Ministry of Interior. The first police force in the Jordanian state was organised after the fall of the Ottoman Empire on 11 April 1921. Until 1956 police duties were carried out by the Arab Legion and the Transjordan Frontier Force. After that year the Public Safety Directorate was established. The number of female police officers is increasing. In the 1970s, it was the first Arab country to include females in its police force. Jordan's law enforcement was ranked 37th in the world and 3rd in the Middle East, in terms of police services' performance, by the 2016 World Internal Security and Police Index.