Scandinavian intelligence services say an 18-year-old Norwegian citizen has been arrested at a Swedish airport, suspected of heading to Syria to join jihadi militants.

Fredrik Milder, a spokesman for Sweden's security service, SAPO, says the man, who was not identified, was arrested Monday in the southwestern city of Goteborg at Norway's request.

Martin Bernsen of Norway's PST service said Tuesday the suspect faces up to six years in jail in Norway if found guilty.

In the first case of its kind in Norway, a court last month gave prison sentences to two men convicted of joining Islamic State militants in Syria. A third man found guilty of providing logistical support.

About 70 people have left Norway to become foreign fighters in Syria or Iraq and some 20 have returned.