The emergency services moved out at 20.30 on Tuesday night after receiving notification that a person had fallen into the river near Rjukandefoss in Hemsedal.
– The person who has fallen into the river tries to hold on, and people on the spot try to secure the person, wrote the police in the South-East on Twitter.
The police were quickly on the scene as they had just been out on another mission where a lorry had run off the road.