An estimated 40,000 people gathered in Oslo on Thursday to sing a popular children's song that the mass killer Anders Behring Breivik has described as Marxist brainwashing.
They sang Children of the Rainbow close to the court where Breivik is on trial for the murder of 77 people in Oslo and on an island last July.
Similar events took place in other parts of Norway.
Breivik, 33, has denied criminal guilt.
