Activists protested against the Norwegian oil industry.
The painting was not injured in this incident. The protective glass of the painting is glued with glue.
National Museum guards arrested three people, two of whom tried to stick to the painting, police announced on Twitter.
The activist organization “Stop Oil Exploration” told the media that its intention was to “wake people up from apathy” and “start a conversation”.
Norway is the largest oil producer in Northern Europe.
In recent months, environmental activists have attracted media attention with radical and unusual forms of protest, including covering famous works of art with groceries and blocking roads.
Dozens of the world’s leading museums released a joint statement on Thursday pointing out that environmental activists attacking the paintings are grossly underestimating the damage they can cause.
