 Paris officials say the River Seine has been safe for swimming 10 or 11 of the past 12 days. $1.5 billion have been spent on cleaning the river, where the swimming marathon and triathlon swimming are slated to take place. Heavy rain could still change that. It prompts an inflow of untreated water that could make the Seine unfit for swimming. Elaine Cobb, CBS News, Paris. Wall Street, right now the Dow is up 311 points. This is CBS News.