The police were alerted to the shooting at 18:22 on Thursday.
A suspected crime scene has been cordoned off and will shortly be investigated by forensics.
The police write on their website that a suspected perpetrator ran from the scene after the shots were fired.
Commuter train traffic is temporarily suspended between Skogås and Haninge due to the ongoing search of the railway area, the police write on their website.
The text is updated.