Top Olympic hope and breaststroke world champion Alexander Dale Oen has died during a training camp in Arizona.
Norway's swimming federation says the 100 metre breaststroke world champion was found collapsed on the floor of his bathroom and was taken to a medical centre in Flagstaff where he was pronounced dead.
The 26-year-old reportedly had a heart attack.
Oen won gold at the World Champs in Shanghai last year and won silver at the Beijing Olympics in 2008.
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