Images of uniformed police appearing to require a woman to take off her tunic, and media accounts of similar incidents, have elicited shock and anger online this week.
Some fear that burkini bans in several French towns are worsening religious tensions. The bans, based on a strict application of secularism policies, have exposed division within the government.
Prime Minister Manuel Valls told BFM television today that burkinis represent "the enslavement of women" and reiterated his support for mayors who have banned them.
"My dream of society is a society where women are free and proud of their bodies," she said on Europe-1 radio. But with tensions in France high after a series of deadly Islamic extremist attacks, she said, "We shouldn't add oil to the fire" by banning burkinis.
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Critics of the local decrees have said the orders are too vague, prompting local police officials to fine even women wearing the traditional Islamic headscarf and the hijab, but not burkinis.
Two human rights groups, arguing the bans are discriminatory, have appealed to the Council of State to overturn the measures.
The council is holding a hearing in the case today and is expected to rule within 48 hours. The ruling specifically concerns a ban in the Riviera town of Villeneuve-Loubet, but the decision will be binding and set legal precedent on the increasingly heated question of whether cities can tell Muslim women what to wear to the beach.
The Human Rights League and the Collective Against Islamophobia in France say the mayor's decree violates basic freedoms of dress, religious expression and movement.
Like other local decrees, the Villeneuve-Loubet ban doesn't explicitly mention the word "burkini.