Oslo's main airport briefly closed one of its two runways on Sunday following a drone observation in the area, operator Avinor said.
The closure was caused by "a small hobby drone" and lasted for some 20 minutes before regular traffic was restored, an Avinor spokesperson said.
The airport, also known as Gardermoen, has two north-south runways and is the second-largest airport in the Scandinavian and Nordic region.
This is a developing story.