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 was actively preventing Ultron from gaining access to nuclear codes. Tony Stark went to the NEXUS Internet Hub in Oslo to find out who their ally was, who was revealed to be the remnants of J.A.R.V.I.S., with Stark managing to recover the remains.