Three military conscripts and one train passenger died and another 11 were injured. The cause of the accident is not yet known.
The stabbing suspect had apparently been denied asylum, but it is not clear if this was the motive behind his attack that left two dead and eight wounded.
Local media report that eight people were hospitalised following the attack. Finnish police said one suspect was shot in the leg and advised people to avoid the centre of the city.
Around 15,000 people marched in central Helsinki to protest against racism and violent right-wing extremism days after a man was killed in an alleged neo-Nazi attack.
Subscribe to our Youtube channel for all latest in-depth, on the ground reporting from around the world.
Copyright © 2022 TRT World.