It had recently taken part in NATO's large-scale Trident Juncture military exercises, where it was engaged in submarine hunting maneuvers.
Update: 0700 UTC - according to latest reports frigate was taken to shallow waters to avoid sinking, water ingress is incontrollable.
Equinor added that it is in dialogue with Norwegian authorities and emergency services concerning the incident.
The Norwegian coast guard said the collision involving the KNM Helge Ingstad frigate and the 113,000-dwt Sola TS (built 2017) happened in Hjeltefjorden, north of the Sture terminal.
Those injured were among the oil tanker's crew, local newspaper VG reported. Views are obvioiusly before the ship partially sank.
Sola TS was loaded with crude oil and was heading to Britain.
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It's not clear who hit whom, but the Norwegian warship was severely damaged under the waterline. The ship's captain chose to beach the ship to prevent it from sinking in deep water. A large gash is visible on the ship in a location typically above the waterline, but that section of the ship is now underwater.
Eight sailors suffered minor injuries and have been taken care of.
At the time of the collision, the tanker was leaving the Sture terminal, 50 kilometres northwest of Bergen, transporting 625,000 litres of crude oil. The tanker, now in port undergoing inspection, was not damaged in the incident and none of its 23-member crew injured.
Helge Ingstad, the Fridtjof-Nansen class frigate commissioned in 2007, was en route to Haakonsvern naval base.
The Helge Ingstad, which was carrying a helicopter, depth charges, torpedoes and a sea-to-air missile defence system, had been taking part in... Seventeen US Navy sailors were killed in the collisions, which involved U.S. Navy 7th Fleet destroyers and commercial shipping.