Thousand of Muslims marched in the French town of Mantes-la-Jolie on Sunday to protest the recent killing of a local police chief and his wife by a man who had sworn allegiance to the Islamic State group.

Between 2,500 to 5,000 people took part in the solemn procession 50km west of Paris, which was organised by local mosques and Muslim groups.

Demonstrators carried a large banner denouncing the "barbaric" act and lifted a photo of a smiling Jean-Baptiste Salvaing and Jessica Schneider, who were murdered at their home in the nearby town of Magnanville on June 13.

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