Police first received word of the incident within the capital of scotland- Kongsberg, south-west from the capital Oslo, at 18:13 local time (16:13 GMT).
A Danish man aged 37 continues to be arrested on suspicion of transporting the attack.
Police believe he acted alone, and can investigate whether or not this was an action of terrorism, a spokesman stated.
Pm Erna Solberg stated reports from the incident have been “horrifying”.
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