The Olympics' triathlon swimming training session scheduled for Sunday has been cancelled after recent heavy rain in Paris affected pollution levels in the Seine, organisers said in a statement.
"The tests carried out in the Seine yesterday revealed water quality levels that in the view of the international federation, World Triathlon, did not provide sufficient guarantees to allow the event to be held," said Paris 2024.
"This is due to rain that has fallen on Paris on July 26-27."
Organisers said they were "confident" water quality would improve again before the triathlon events begin on Tuesday with the men's race.
The French capital has been working on cleaning up the Seine so people can swim in it again, as was the case during the 1900 Paris Olympics.

Rutherford and Motie shine as West Indies sink England
Australia begin T20 World Cup with win over Ireland
Thomas Frank sacked by Tottenham
S Africa survive double Super Over drama against Afghanistan
Farhan fires Pakistan to 32-run win over US in T20 World Cup
