Norway’s security agency says the bow-and-arrow attack that killed five people appears to have been an act of terrorism.
The Danish man who is in custody is a Muslim convert who had previously been flagged as having being radicalized, police said earlier.
The victims were four women and one man between the ages of 50 and 70.
The 37-year-old Dane is suspected of having shot at people in a number of locations in the town of Kongsberg on Wednesday evening. Several of the victims were in a supermarket, police said.