Sunday's Ironman event in Remich has been reduced to cycling and running after organisers removed the swimming leg shortly before the scheduled start.
The decision was taken for safety reasons after blue-green algae were detected in the Moselle.
The cycling and running sections will still go ahead as planned, although the start of the race has been pushed back to 8.25pm.
Blue-green algae tend to form in warm water and can be harmful to people and animals. By Thursday, the Moselle had already warmed to more than 26C, meaning neoprene wetsuits would in any case not have been permitted for the swimming leg.
