Mosques across France held their weekly services on Friday in the shadow of last week's Paris massacre by Islamist militants, with sermons rejecting violence and asking how some radical French Muslims could support it.

Before dawn, the government's announced crackdown on radical preachers led to a search of a mosque in the west coast city of Brest, known for its imam's hardline views, but police found no evidence of anything illegal.

The Grand Mosque of Paris called off a planned rally against terrorism there, due to be held after midday prayers and attended by the city's mayor Anne Hidalgo, because police said they could not assure its security.

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