"People traveling in Schengen area and Scandinavian citizens do not need to have a passport to enter a country in Schengen area. But Norway police introduces new measures in the frame of the terrorist threat
“People traveling in Schengen area and Scandinavian citizens do not need to have a passport to enter a country in Schengen area. But Norway police introduces new measures in the frame of the terrorist threat and made it compulsory to carry passport.”
See the article: Norway Police Requires Passports or ID Cards for Even Norwegian and Schengen Area Citizens – As a result of the measures for terrorist threat, all must have their passport or ID card upon entry to Norway (The Nordic Page, link)