I have been in Oslo Norway 6 times in the mid- late 80′s and early 90′s. I had friends from Norway. We worked together on Royal Caribbean Cruise Lines. A matter of fact, I slept overnight in its airport waiting for an early flight back to Heathrow. I felt safe there, no need to get a hotel room. They lock the doors and you store you luggage in a closet. Sleep on the benches. They give you a pillow. One time all air flight stopped as the King of Norway entered. ( Sorry, I forget his name)
That was way before 9/11 and the Tower came down. That day the world changed forever. R.I.P. World Trade Center.