Two athletes, one from Britain and the other from Mexico, died on Thursday on the first day of the Torremolinos-Andalucia Triathlon Championship Finals, World Triathlon said.
Both athletes were competing in the age-group sprint event.
British Triathlon confirmed the death of one of its age-group team members, without revealing his identity or cause of death.
The Mexican Triathlon Federation reported the death of Roger Mas Colomber, aged 75. "It is with deep sadness that we inform you that two competitors (one from Mexico, one from Britain) have died at the World Triathlon Torremolinos-Andalucia AG Sprint Distance World Championships," World Triathlon said in a statement.
Torremolinos is hosting the event from Oct. 17-20, with more than 5,500 triathletes from over 80 countries competing.