Finnish police said on Saturday that an 18-year-old Moroccan man arrested after knife attacks that killed two people in the city of Turku appeared to have specifically targeted women and that the spree was being treated as terrorism-related.

The suspect arrested on Friday after being shot in the leg by police had arrived in Finland last year, they said, adding they later arrested four other Moroccan men over possible links to him.

"Due to information received during the night, the Turku stabbings are now being investigated as murders with terrorist intent," Crista Granroth from the National Bureau of Investigation told a news conference.