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Police were reported on Wednesday to have detained 10 suspected Islamic militants in early-morning raids across France — the latest in a series of measures apparently designed to display a forceful response to the killings seven people in the southwest of the country last month.

The round-up, with police officers and domestic security agents raiding at least five locations as far apart as Marseille in the south and Roubaix in the north, came 18 days before the first round of French presidential elections in which law-and-order issues have assumed prominence since the March attacks in Toulouse and Montauban.

“If there are suspicions, if there are risks, then they must be acted upon,” the Socialist candidate, François Hollande, who is leading President Nicolas Sarkozy in opinion polls, said in a radio interview on Wednesday. “But what might be surprising is why do it after an act of terrorism which has, it is true, deeply affected our spirits?”

“I am not questioning what is being done. All I am saying, simply, is that we should have perhaps done more beforehand.”

The language is particularly pointed after the murders in Toulouse of three Muslim soldiers and four Jews, three of them children, by a French-born Muslim, Mohammed Merah, 23, who claimed inspiration from Al Qaeda. Mr. Merah was killed by elite security forces after a 30-hour standoff.

Mr. Sarkozy has said the recent series of raids have no connection with the Toulouse killings or presidential politics.

News report quoted unidentified police sources as saying the 10 people arrested were suspected of either planning to travel to or returning from Afghanistan or Pakistan for training. The 10 were said to be individuals rather than an organized network and to have the same disaffected, loner’s profile as Mr. Merah, who claimed to have ties to Al Qaeda.

The latest arrests came a day after a state prosecutor said judicial authorities will indict 13 Muslim radicals suspected of plotting terrorist acts in France, though he acknowledged that any plans of violence by them had remained at an “intellectual” stage, including a plot to kidnap a magistrate in Lyon.

The 13 individuals, members of the Islamist group Forsane Alizza, or Knights of Pride, were arrested in raids across the country on Friday.

Disbanded earlier in the year on government orders, the group hailed the deaths of Western soldiers in Afghanistan and called for an end to the French ban on the Muslim full facial veil, but its leader has denied any plans to commit violence.

Investigators recovered three Kalashnikov assault rifles in the suspects’ possession, along with several handguns, according to François Molins, the prosecutor.

Members of the group had in recent months participated in “physical training” in public parks and forests near Paris, Mr. Molins said, and had undergone “religious indoctrination.”

He declined to offer further details.

News reports quoted police officials as saying the arrests on Wednesday were not part of the same investigation.