Oslo is the capital city of Norway.
Norse Paganists Riots
Nystrom, Larsen and a group of about a dozen of their followers destroyed many properties and left at least 20 injured, three in critical condition, proclaiming themselves to be gods in a message spelled out on the streets of Oslo.
The Avengers learned from Nick Fury that someone prevented from Ultron getting nuclear codes. Tony Stark went to NEXUS base in Oslo to find who was that person. It was revealed that it was J.A.R.V.I.S.. Stark managed to recover him.