The names of the victims are published here: Alle fire omkom - Nyheter - Innenriks - Aftenposten.no.
(The article is in norwegian) It also has a short videoclip that indicates the conditions in the area.
* Pilot Haakon Hassel Bergerud, Dilling, 34 år
* Frode André Bjørkli, Oslo, 31 år
* Nikolai Bleness, Oslo, 41 år
* Beate Tangstrøm Rutledal, Oslo, 28 år
- Klokken 01.42 ble den siste av de fire omkomne hentet opp. De er fraktet til sykehuset i Vestfold, sier operasjonsleder Anne Meyer
One additional piece of information that have come out via ATS is that it seems there may have been a radio transmission from the helicopter just before it crashed. No hint of the content of this has been released.