and was used to imprison both prisoners of war and criminals. Vollan was not considered a concentration camp. In a summary of prisoners of war in Norway, numerous prisoners were registered at Vollan. One of its roles was as a transit camp for political prisoners. Many prisoners were taken from Vollan to Kristiansten Fortress and shot. The prisoners at Vollan were interrogated at the Mission Hotel in Trondheim. Some were also interrogated by Henry Rinnan and his gang. It was closed in 1971 after the opening of Trondheim Prison at Tunga. Trondheim Prison (Norwegian: Trondheim fengsel) is a prison that belongs to the Northern Region of the Norwegian Correctional Services. The prison can house 184 inmates. It consists of four main departments: Nermarka ("Tunga") – closed department Detention department (no: Forvaringsavdelingen) at Nermarka Leira – open division. Through joint positive activities, the individual inmate on certain conditions teaches to be responsible with other people. division Kongens gt. – halfway house, located in downtown Trondheim. Government The municipality is governed by a municipal council of elected representatives, which in turn elect a mayor. On 1 January 2005, the city was reorganized from five boroughs into four, with each of these having separate social services offices. The current boroughs are Midtbyen (44,967 inhabitants), Østbyen (42,707 inhabitants), Lerkendal (46,603 inhabitants) and Heimdal (30,744) inhabitants. The Population statistics listed are as of 1 January 2008. Prior to 2005, Trondheim was divided into the boroughs Sentrum, Strinda, Nardo, Byåsen and Heimdal. Municipal council The city council (Bystyret) of Trondheim is made up of 67 representatives that are elected every four years. Prior to 2011, there were 85 city council members, but this number was reduced to 67 in 2011. The party breakdown of the council is as follows: Education and research See also the list of primary schools in Trondheim. Trondheim is home to both the Norwegian University of Science and Technology (NTNU) with its many technical lab facilities and disciplines, and BI-Trondheim, a satellite campus for the Norwegian Business School (BI). Both universities welcome a number of international students on a yearly basis and offer various scholarships. St. Olav’s University Hospital, a regional hospital for Central Norway, is located in downtown Trondheim. St. Olav's is a teaching hospital and cooperates closely with the Norwegian University of Science and Technology (NTNU) on both research and medical education. SINTEF, the largest independent research organisation in Scandinavia,