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. Last Updated: 07/27/2016

2 British Sailors Killed on Sub

ReutersThe HMS Tireless, seen here in the Arctic, is a Trafalgar class submarine.
ANCHORAGE, Alaska -- Two British sailors were killed in an explosion aboard a British navy nuclear-powered submarine in the Arctic Ocean, and one injured crew member was evacuated to a hospital in Anchorage, officials said Wednesday.

The explosion occurred late Tuesday aboard the HMS Tireless, which was submerged beneath an ice cap 275 kilometers north of Deadhorse, Alaska.

The submarine was conducting a joint exercise with the United States when its air purification system malfunctioned, British defense officials said.

The U.S. Navy said a self-contained oxygen generation candle had exploded.

The attack submarine surfaced quickly and its nuclear reactor was not affected, officials at the British Ministry of Defense said.

The Tireless does not carry nuclear missiles.

The injured sailor, whose name was not released, was transported by the Alaska Air National Guard from Deadhorse, in northern Alaska's Prudhoe Bay, to Kulis Air National Guard Base in Anchorage, 1,000 kilometers away, where an ambulance took him to a local hospital.

He was in stable condition, hospital spokeswoman Kjerstin Lastufka said.

The Tireless was operating with the USS Alexandria in a joint operation to test submarine operability and tactical development in Arctic waters.

The submarine's forward compartment was damaged in the explosion, forcing the submarine to surface quickly through the ice.