Paris Olympics cancels triathlon training session because Seine too dirty

The first swimming training session for triathletes competing at the Paris Olympics was cancelled Sunday because of pollution in the river Seine.

Whether the Seine will be clean enough to host Olympic triathlon and open-water swimming events has been a much debated topic at the Games. Paris Mayor Anne Hidalgo took a highly publicized dip in the Seine last week in a bid to ease fears. Organizers have spent more than $1.5 billion trying to overcome the river's high levels of E.coli bacteria.