The lack of Muslim chaplains in French jails is a factor in the increase in the number of people being radicalised while serving time, a Muslim chaplain said Monday.

The comment came after France's Interior Minister Manuel Valls predicted more arrests of Islamic extremists and warned of possibly hundreds of home-grown militants.

"In a large number of prisons, there is no Muslim chaplain," said Abdelhak Eddouk, a chaplain at Fleury-Merogis detention centre in the Paris region.

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