Water in the Seine River had unsafe elevated levels of E. coli less than two months before swimming competitions are scheduled to take place in it during the Paris Olympics, according to test results published Friday.

Contamination levels in the first eight days of June, after persistent heavy rain in Paris, showed bacteria such as E. coli and enterococci beyond limits judged safe for athletes.

The report was published by monitoring group Eau de Paris one day after a senior International Olympic Committee executive said there were “no reasons to doubt” races will go ahead as scheduled in in a historic downtown stretch of the Seine near the Eiffel Tower.