The alarm came at 10.30pm on Thursday night.
– He was awake and talkable when he was found, says Göran Carlbom, officer on duty at the police.
Police have cordoned off the site pending a technical investigation and collected witness information from people who were in the area.
– Now we are in the process of forming an opinion about what happened, says Göran Carlbom.
No person has been arrested.