A man with a knife killed two people and wounded eight others in a stabbing rampage in a market square in the Finnish city of Turku on Friday, police said.
Police shot the suspected attacker in the leg and arrested him. They said they had yet to establish the identity of the man who was of foreign origin, or his motive, reports Reuters.
A witness told Reuters she had seen a man stabbing a woman and other people sobbing at what they had seen after running away in terror.
Police warned people to stay away from the city and reinforced security nationwide, with increased patrols and more surveillance, in case more people were involved. People were allowed to return to the city center a few hours later.
"At this stage, there is only one suspect and we are investigating whether there are more people involved ... but it looks likely (he was alone)," Markus Laine from the National Bureau of Investigation said.
"For now we do not investigate this (as a terrorist attack) but the possibility has not been ruled out," he told a news conference.
Police said they would hold the next news conference in Turku on Saturday at 1100 GMT.
People laid candles and flowers at the scene of the attack in the evening.