The New Terrorist Threat

Radical groups know our vulnerabilities. Here's how to fight back

As millions mourned in the streets of Madrid, counterterrorism officials around the world struggled to analyze the implications of the attacks for their own cities. None of the lessons are comforting. If the assaults were not by al-Qaeda, it means that other groups think they have to mount an attack that slaughters hundreds of innocents to get attention. If those responsible for the outrage in Madrid were not Osama bin Laden's foot soldiers, others have learned that such attacks are not very difficult to stage. Equally troublesome, however, is the possibility that 3/11 was an al-Qaeda--related attack; that would be another...

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