A man has been arrested on suspicion of attempted murder in Skärholmen, in southern Stockholm.
The incident took place at a residence, according to the police spokesperson.
A person in his 80s has been taken to hospital by ambulance helicopter.
The police were alerted to the incident on Saturday afternoon.
– We can establish that it is a person who has been injured with some type of stabbing weapon. I consider that person to be seriously injured, says Carina Skagerlind, press spokesperson at the police.
The injured person is in his 80s and has been taken to hospital by ambulance helicopter. The condition of the injury is said to be stable.
A man has been arrested on suspicion of attempted murder.
The police continue to work with technical investigation, and do witness interviews and door knocking.