The alarm came at 23.21 on Wednesday night.
One person had then been found injured
- It is about stab or cut injuries, says Jari Kalliorinne, duty officer at the police.
The person has been taken to hospital with unclear injuries.
A suspected perpetrator has been arrested.
Police have cordoned off the suspected crime scene pending a technical investigation.
- We also hold interrogations with witnesses, says Jari Kalliorinne.
The incident is classified as attempted murder.