At least two women have been detained in France while wearing Islamic veils across their faces, after a law banning the garment in public came into force.
Police said they were held not because of their veils but for joining an unauthorised protest against the ban.
France is the first country in Europe to publicly ban a form of dress some Muslims regard as a religious duty.
Anyone caught breaking the law will be liable to a fine of 150 euros (£133; $217) and a citizenship course.
People forcing women to wear the veil face a much larger fine and a prison sentence of up to two years.
It was not clear whether the women detained at the protest would also be fined for their veils.
BBC News - Women in face veils detained as France enforces ban
Being required to remove a veil in an area where security / identification is an issue (like airports) is reasonable enough, but being banned from wearing it in a public park seems a bit draconian.