Finnish police have shot a man who stabbed several people in the city of Turku, according to law enforcement. One person has been apprehended, police wrote on Twitter.
Police have also wrote that they are looking for potential additional suspects.
The Turun Sanomat newspaper reported that an elderly woman and a young boy have been injured, citing an eyewitness.
The witness added that another elderly woman was injured on the other side of the square where the incident reportedly took place.
Multiple ambulances are at the scene, according to the newspaper.
The outlet also reported that a body has been covered at a junction, and that police and rescue personnel are at the scene.
Finnish tabloid Ilta-Sanomat reported that six people were injured, one man and five women, and that a woman pushing a stroller was among those attacked by a man with a large knife.
Authorities have warned people to stay away from the city center following the attack, which reportedly took place in the Puutori-Market Square area.
Finnish police said they have reinforced security at Helsinki Airport and train stations throughout the country.
A video posted online appears to show the moments after the incident, with people running down the street. Shouting is heard in the background. The tweet reads there were apparently shouts of “Allahu Akbar” and that it is a terrorist attack. However, there has been no official confirmation.
A press conference addressing the incident will be held at 16:00 GMT. The national police commissioner and interior minister will participate, police announced.
The attack comes just one day after a van plowed into pedestrians on a popular tourist street in Barcelona, killing 13 people and injuring more than 100 others.
Hours later, terrorists launched a second attack in the seaside town of Cambrils, injuring seven people, one of whom later died. Police killed five people believed to be behind the attack.
Stabbing attacks have taken place across Europe in recent months. In late July, a knife-wielding man shouting “Allahu Akbar”attacked police on the Spanish-Moroccan border, injuring an officer. The suspect was immediately arrested.
An asylum seeker went on a stabbing spree at a supermarket in the German city of Hamburg that same month, killing one person and injuring several others. Hamburg State Interior Minister Andy Grote said the man was known to authorities as an Islamist.
In June, an attack in the London Bridge area of the British capital saw terrorists stab people at Borough Market after plowing into pedestrians with their vehicle.