On a hot day in August 2007, an estimated 90,000 people gathered in the Bung Karno Stadium in Jakarta, Indonesia, to call for the re-establishment of the Caliphate. The event was organised by Hizb-ut-Tahrir Indonesia, a chapter of the transnational movement Hizb-ut-Tahrir (Group of Liberation) whose key aim is the revival of the Caliphate.