Rescue services and police are in the morning. It was a passerby who sounded SOS alarms after finding a body in the water.
"We don't know anything about the circumstances or whether it is a man or a woman," says Torbjörn Krokström, internal commander, the South Rescue Service.
The police have blocked off a large area on land.
At present, the police cannot comment on whether there is any criminal suspicion in the case.
"It will take a couple of hours, maybe more, before we can say anything further," said informant Patric Fors at the police's command center at 13 o'clock on Saturday.
The technical investigation was still underway.
This article will be updated