Hizb ut-Tahrir supporters calling for a worldwide Islamic state have marched through Gaza for the first time. About 3,000 demonstrators waved black flags and shouted slogans calling for a global Islamic government Thursday. Hizb ut-Tahrir seeks to establish a caliphate that would govern the world according to Islamic law. The group was founded in Jordan in 1953 and is banned in several countries, including Russia, Germany and some Arab states. The group's activities are outlawed in the West Bank. This week in the West Bank city of Hebron, 20 members were arrested. The group says it uses nonviolent means but is seen as ideologically close to Jihadist groups. The tiny group opposes the Islamic Hamas, which rules Gaza.