**Rescuers are searching for four people in icy Norwegian waters after the helicopter they were flying in crashed.**The civilian helicopter crashed in the Oslo fjord, just offshore from Horten, a town an hour south of Oslo in south-eastern Norway.
The Norway Central Rescue had sent boats and divers to the site, a spokesman said.
It was unclear what caused the crash. Foggy weather had shrouded the area making the search difficult.
Rescue centre spokesman Einar Knudsen said the Robinson-44 helicopter, one of two flying down the fjord towards Oslo after an afternoon flight, was owned by Midtnorsk Helicopter Service.
Asked about finding survivors, rescue official Stein Solberg told AFP news agency: “We are still hopeful until the contrary is proven.”
Wreckage from the helicopter had already been spotted on the ice, he said.