A suspect has been detained after a fire engulfed Kehlsteinhaus, Adolf Hitler’s former mountain retreat known as the Eagle’s Nest, in Bavaria. Fire crews were called to the site on Friday at 21:52 local time, and by the time they arrived, the building was already hit by a large-scale blaze. Firefighters struggled to put it out because of the remote location, at 1,834 metres above sea level. Police said no one was believed to have been in the building at the time of the fire, and authorities do not currently expect anyone was injured. The cause of the fire is still unknown, and the investigation is ongoing. Kehlsteinhaus was completed in 1938 during the Nazi regime and stood within a closed Obersalzberg area where Nazi leaders had residences and government facilities. The structure was intended as a setting for political get-togethers away from the public, with Hitler hosting diplomats and other foreign guests. Later, it was also used by Nazi officials for rest and private celebrations, and Hitler stayed there with his partner Eva Braun. Since 1952, Kehlsteinhaus has operated as a mountain restaurant and includes an exhibition about the building’s history. The site was set to remain open for visitors until 8 November, according to Bergerlebnis Berchtesgaden. Police have detained a suspect in connection with the fire, but details on what was found or what the suspect is accused of have not been released, with investigators continuing their work.