Arrested on Tuesday and released the same day, they face fines of up to 750 euros ($813) for defacing public transport equipment, they added.

Environmentalist movement Extinction Rebellion's Paris chapter posted a video to X, formerly Twitter, on Tuesday of a young woman placing the stickers on the window of a metro train.

They denounce "doubled air traffic" to France during the games, "social cleansing" and video surveillance combined with computer algorithms.

"Faced with over-representation of the 2024 Olympic Games in our city of Paris and our imaginations, we're putting the real Olympic Games on show, which destroy and lay waste," they wrote.

A police source told AFP the activists had carried out their action at a major interchange in southern Paris, and the Assemblee Nationale metro station serving the French parliament.

The people were arrested on the street on suspicion of committing property damage as a gang, the source added -- a charge prosecutors decided not to press.

"Paris 2024 hasn't even got started but people are already being held in custody for... eco-terrorism: stickers and water-based paint," Extinction Rebellion posted to X Thursday.

"We'll be out of our cells for our action on July 27, see you Saturday," they added.

The activist group has trailed a demonstration dubbed Jeux Interdits ("Forbidden Games") for Saturday, the day after the Olympic opening ceremony, without making any details public.

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