Jewish and Muslim leaders here warned on Monday of rising anti-Semitism among young Muslims, two days after the police arrested 11 men and fatally shot one in raids in a handful of cities aimed at young radical French Muslims.

President François Hollande met with Jewish and Muslim leaders on Sunday and promised tighter security at Jewish religious sites. He said that a new law would soon make it a crime to travel to militant training camps. "Nothing will be tolerated; nothing should happen," Mr. Hollande said in a statement. "Any act, any remark will be prosecuted with the greatest firmness."

News of the raids added to the anxieties of France's Jewish and Muslim populations, which were already unnerved by the killings in March of three French service members, a rabbi and three Jewish children in the Toulouse region by a French Muslim who had trained with Islamic militants in Pakistan. Muslim and Jewish spokesmen say they worry about the domestic expansion of radical Islam.

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