At least 21 cyclists were injured, including four-time champion Chris Froome of Britain.
Police did not name the woman, who was in custody on Wednesday. However, local media said she was a 30-year-old Frenchwoman. At first it was thought she was German because her homemade banner was a mix of French and German: “Allez opi omi” or “Go grandpa, grandma.”
The woman fled the scene but police appealed to the public for information about her identity after the Tour organizers, ASO, said they would bring a lawsuit against her for involuntarily causing injury through reckless behavior — a charge that carries a $1,770 fine.
On Thursday, however the ASO said it no longer wanted to press charges, in a bid to calm the situation, but they reminded fans to keep away from the riders.