According to police, the man's injuries were caused by some form of sharp object.
Who or what released him outside the police station is unclear.
- Right now it is a bit of a mystery for us, but we hope to get clarity in this during the day.
We do not know how the transport took place - if it was carried out by someone who encountered the man, knew him or has to do with the incident itself, says police spokesman Johnny Gustavsson.
According to him, the injured man is in his 50s and a resident of Eskilstuna.
At the time of writing, it is unclear how he is feeling.
- He was rushed to hospital as soon as we found out what happened.
It was the police who drove him to avoid a delay, says Johnny Gustavsson.
The police are investigating the case as aggravated assault or attempted murder.