It was at 11 o'clock that a passer-by found the body outdoors, at Hamngatan in Enköping next to Enköpingsån.
- It is probably a case of illness.
In any case, this is the first assessment made by police officers who have been on the scene, says Petra Blomqvist, press spokesperson for the police.
The body was found next to a parking lot for trucks.
An ambulance has transported the body away.