The frigate Helge Ingstad sustained severe damage in the collision, which occurred only about 15 minutes after the tanker TS Sola, carrying approximately 600,000 barrels of oil, set sail under tow from Equinor's Sture terminal.
The KNM Helge Ingstad frigate, which was returning from NATO's Trident Juncture exercises, was evacuated after the collision with the Sola TS tanker, Norway's army said. There were fears it would sink as it took on water after the crash but it ran aground just off the shore near Bergen.
Pictures show water has also overwhelmed the frigate's helicopter platform on its stern.
The tanker, with 23 crew, suffered damage well above the waterline.
"We are working on stabilizing the vessel", Norwegian Navy Counter-Admiral Nils Andreas Stensoenes told a news conference, adding that the eight injured were all Navy crew.
Several offshore rigs that were pumping their production into the Sture terminal, a major tanker port for crude oil, temporarily suspended the flow, Norwegian newspaper Dagens Naeringsliv reported.
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An oil tanker rammed a Norwegian navy frigate Thursday in a harbor on the country's western coast, tearing a large hole in its side, the military said.
Johan Marius Ly of the Norwegian Coast Guard said the 442ft frigate, which had recently taken part in the North Atlantic Treaty Organisation drill Trident Juncture, was listing, adding: "We have been told that there is a leak from the frigate".
Heavy shipping traffic is the norm at Sture, where a quarter of all oil produced in oil-rich Norway is processed.
No oil spill has been reported from the tanker, which was sailing from Equinor's Sture terminal in Øygarden. He declined to comment on what would happen to the weapons on board the ship.
An investigation into the causes of the incident will be launched today, in collaboration with the Defense Accident Investigation Board Norway (DAIBN) and the Marine Safety Investigation Unit (MSIU) from Malta.