As many as 250,000 people united around the world to pray against the banning of headscarves in French schools.
The mass prayer, which took place at 2pm on Wednesday, was organised by a group of Sikhs in the UK, including 10 children, who oppose the ban.
They sent an e-mail asking people of all religions to join in. Spokesman Davinder Singh said he was "completely overwhelmed" by the huge response.
French MPs voted on 10 February to ban all religious symbols in schools.