2 British sailors die in accident on nuclear sub

Two British submariners died and one was injured Wednesday after their nuclear-powered submarine's air purification system malfunctioned during an exercise in the Arctic, defense officials said. The HMS Tireless was submerged under an ice cap at the time of the 0420GMT incident, but surfaced quickly. The submarine's nuclear reactor was not affected, the Ministry of Defense said in a statement. Tireless is a hunter-killer submarine and does not carry nuclear missiles, the ministry said.