Four people were stabbed near a shopping centre in Tampere, Finland's third-largest city, on Thursday and one person has been arrested, the police said.
In a later statement, police said that the stabbings had not resulted in any fatalities. They did not give further details on the extent of the injuries nor on the perpetrator.
The situation no longer posed a danger to others, the statement added.
Public broadcaster YLE earlier reported that traffic in the centre of Tampere - located some 180 km (112 miles) north of Helsinki - is at a standstill.
Daily Ilta-Sanomat reported that a witness saw bystanders giving first aid to two people lying on the ground at the time police arrived, and that, according to its information, the person arrested is a Finnish man in his twenties.
Local paper Aamulehti also reported that the person arrested is a man.
Police later said they had checked the surroundings, lifted the earlier cordons and left the scene.

Trump says Iran war deal close as Strait of Hormuz tensions linger
Ukraine and Russia trade overnight drone strikes, officials say
UN says Taliban arrest 30 women for violating hijab rules in Afghanistan
Trump cancels US strikes on Iran, citing progress in talks
South Korea court sentences ex-President Yoon to 30-year jail term in drone case
Thai king's eldest daughter dies, aged 47, after long illness
US confirms third strike on Indian-crewed tankers this week
UK defence minister Healey quits, says PM Starmer's plans fail to keep country safe
