Its crew of 137 had been evacuated, rescue leader Ben Vikoeren at the Joint Rescue Coordination Centre for southern Norway said.
The frigate is believed to be the KNM Helge Ingstad, which took part in NATO's massive Trident Juncture 2018 wargames. Two of them were taken to a nearby hospital. The military said the ship, which had recently taken part in the vast North Atlantic Treaty Organisation drill Trident Juncture, is taking on water. The frigate was lying in the water nearly on its side with its stern under the water.
The 134-meter (442-foot) long frigate, built in Spain in 2009, has a helipad platform on its stern. The alliance has been informed of the accident, he said.
Meanwhile, the 62,000-tonne oil tanker, which was flying the Maltese flag but is owned by a Greek shipping company, was only slightly damaged and none of the 23 people on board were injured, the rescue centre said.
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. The police, which investigate marine accidents in Norway, have cordoned off the area around the stricken frigate for fear of explosions.
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Greek Aframax tanker SOLA TS collided with Norway Navy frigate HNOMS HELGE INGSTAD in the morning Nov 8, probably around 0300 UTC, in North sea north of Bergen, Norway.
Eight people were injured in the crash and the warship's crew of 127 have been evacuated from the listing vessel. The collision tore a large hole in the hull of the vessel, which began taking on water and had to be pushed into shallow coastal waters by tugboats to keep it from sinking.
"We are in a security phase for the time being", he said.
Comment: Again, laden massive cargo ship collided with Navy frigate, similar to accidents which occurred with USA Nay frigates in Japan and off Singapore, recently.
Some 10,000 liters of helicopter fuel from the frigate has leaked into the sea, said Johan Marius Ly of the Norwegian Coast Guard.