At 22.34, the police were alerted to Märsta, north of Stockholm municipality.
Police found a dead man in his 55s in an apartment building.
- We believe that a man was killed, says the police officer on duty Jari Kalliorinne.
Why do you think so?
- We found a dead man there.
What we have found indicates that someone else caused it.
Has any shooting been reported?
- Not that I know of.
A 35-year-old man suspected of murder has been arrested.
The police will now hold interrogations and knock on doors.