Armed police scrambled to the middle of Turku as a knife-wielding man rampaged through the city - as a manhunt was launched to find the attackers
People were left covered in blood after the shocking mid-afternoon attack which saw eight people rushed to hospital.
Cops warned people to stay away from the city and reinforced security nationwide, with increased patrols and more surveillance, in case more people were involved.
"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)," said Markus Laine from the National Bureau of Investigation.
"At this stage, we do not investigate this (as a terrorism attack) but the possibility has not been ruled out," he told a news conference.