Police officials were quoted in the media as saying that the suspected attacker was shot in the leg and nabbed.

Officials added that even though they know the identity of the attacker, they will not reveal it now.

One among the deceased was a woman.

Police have also confirmed that all the casualties were adults.

Forces later raided an apartment and made a number of arrests overnight, the BBC reported.

"We are investigating what their role is in this. Whether they had something to do with this act, or if they were just involved with this person," Finnish news agency SST quoted detective superintendent Markus Laine as saying.

The raid took place in the Varissuo area of the city, which is home to a large number of immigration population.

Describing the incident, an eyewitness told BBC, "I saw police shoot a person, a man I think. People were running and there was talk about a knife attack, possibly multiple perpetrators."

However, Finnish authorities have said that it was too early for them to treat the incident as a terror attack.

Authorities also said that the attacker had likely acted alone.

The Finland attack took place just 24 hours after an attack claimed 13 lives in Spain's Barcelona.

Condemning the Finnish stabbing spree, European Commission President Jean-Claude Juncker said, "We strongly condemn this unprovoked attack which comes only 24 hours after the horror that unfolded in Spain."

Image: Wallpaper