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The previously unpublished video footage, showing the moment the bomb exploded outside the centre-left government's headquarters on July 22 last year, is due to be aired in a special edition of NRK show Focal Point on Tuesday.

Accusing his victims of fostering multiculturalism, Anders Behring Breivik detonated the bomb and gunned down participants at a youth camp on the island of Utoeya, killing a total of 77 people.

Breivik was given Norway's maximum sentence of 21 years in jail, which can be extended indefinitely. He is expected to spend most of that time at the Ila prison near Oslo