"[The collision is] fairly unusual given that one is a highly modern military vessel - the pride of the Norwegian navy - which should detect and avoid a huge tanker".
The Norwegian frigate KNM Helge Ingstad takes on water after a collision with the tanker Sola TS, in Oygarden, Norway, Thursday Nov. 8, 2018.
Eight people on the KNM Helge Instad were slightly injured when the accident occurred at 4 a.m. local time in Sture, north of Bergen, the Joint Rescue Coordination Center for southern Norway said.
All of the frigate's 137 crew members were successfully evacuated, with eight of them sustaining light injuries during the collision.
The tanker, which was carrying a crew of 23, was returned to port for an inspection.
The frigate, which recently took part in a major North Atlantic Treaty Organisation military exercise, was aground and tilting on one side, live television pictures showed.
Heavy shipping traffic is the norm at Sture, where a quarter of all oil produced in oil-rich Norway is processed.
Aerial footage taken by Norwegian coastal administration aircraft during the day shows the frigate partially submerged sitting on her starboard side on the rocks.
"It took on a lot of water and there is a real danger that it sinks where it is", an official for the rescue centre added.
Crude oil tanker SOLA TS, IMO 9724350, dwt 112939, built 2017, flag Malta, manager Tsakos Columbia Shipmanagement (TCM) SA.
The tanker had left Equinor's Sture oil shipment terminal with a cargo of crude, and the facility was shut for several hours on Thursday as a result.
Some 10,000 litres of helicopter fuel from the frigate's tanks leaked into the sea, Johan Marius Ly of the Norwegian Coast Guard said. He declined to comment on what would happen to the weapons on board the ship.
The KNM Helge Ingstad frigate was launched in November 2007 and measures 134 metres long.
The Accident Investigation Board said because the tanker is Maltese-registered, the Marine Safety Investigation Unit (MSIU) of Malta will participate in the investigation.