Anne Hidalgo had originally planned to swim in the river last month but was forced to delay after tests indicated the presence of faecal matter was 10 times higher than authorised limits ahead of impending Games.
Attal will lead a caretaker administration with restricted powers until a new government is named; the leftwing New Popular Front alliance has still not managed to name a consensus candidate for prime minister.
The hung parliament that has resulted from Emmanuel Macron's decision to call snap parliamentary elections is turning into an even deeper crisis after the broad leftwing alliance, which won most votes, is divided over who to propose as the next prime minister.
To a backdrop of high political tensions following the deadlocked result of France's snap parliamentary elections, the traditional Bastille Day parade in Paris was a re-routed and scaled-down affair because of the preparations for the Olympic Games in the capital.
French national rugby team players Oscar Jegou, 21, and Hugo Auradou, 20, have been charged in Argentina, where they have been playing a tournament, of the aggravated rape of a woman, now hospitalised, who has accused them of violent sexual assault in their hotel accomodation.
At least four people died and nine others are in a serious condition after an inflatable dinghy carrying more than 60 people attempting to cross the Channel from France to Britain capsized off Boulogne-sur-Mer in the early hours of Friday.
More than 60 firefighters were involved in containg a blaze that broke out on Thursday during repair work on the spire of 151-metre tall Gothic 12-century cathedral in Rouen, northern France.
