A residential building in Oslo has been engulfed in a massive fire characterized by large open flames. Police operation leader Tor Grøttum reported a potential explosion at the scene. Due to the intensity of the blaze, there is a significant risk of the fire spreading to nearby residential structures. Authorities have urged the public to clear the area to ensure safety. Residents of the affected building successfully evacuated themselves. Additionally, neighbors in adjacent buildings have been evacuated as a precaution. No injuries have been reported thus far.