Police in Turku are investigating two suspected murders and one suspected attempted murder after responding to a report of a shooting in an apartment building shortly after 4am on Saturday morning.
Officers found the bodies of two victims, as well as a third person with injuries, when they arrived at the scene in the Perno district of the southwestern city.
Police say they then arrested a 30-year-old suspect in the stairwell of the apartment building.
In a statement released on Saturday morning, police added that they believe several shots were fired at the scene.
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"The investigation is in the early stages, and the police are investigating the course of events at this stage," Inspector Mika Paaer said, adding that they already have a preliminary understanding of the sequence of events.
"However, I don’t want to say what the motive was at this point," Paaer said.
He added that police will provide further information at a later stage.