A security guard in the Norwegian government building struck by a car bomb that killed eight people, detonated by mass killer Anders Breivik, told a court today he had just put a security camera on the number plate when it exploded.

Tor Inge Kristoffersen described the scene in central Oslo as a "war zone" as he gave evidence in the trial of Breivik who has confessed to the bombing and a subsequent shooting massacre that left 69 dead at a political youth camp.

Mr Kristoffersen, who was working in the basement of the building, said he and a colleague used security cameras to get a closer look at the number plate so that they could find out more about the vehicle.

He says "the moment we had zoomed in on the plate the car exploded."

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