With a new threat of terrorism coursing through Europe, intelligence and police authorities say they are acting more aggressively, with greater emphasis on pre-emptive action to roll up networks of Islamic militants whose members may not have committed crimes, but who have the skills or ideological resolve for violence....The French had kept a group of Moroccan-born militants under surveillance for some time, but had no specific cause to arrest them when the police struck in dawn raids on Monday, seizing 13 men with suspected links to the Moroccan Islamic Combatant Group. A senior French official admitted as much on Tuesday, saying "There was no evidence they were preparing an imminent attack in France." The crucial factor was that they had traveled to Afghanistan, where they learned to use weapons and make explosives.
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