PARIS — The slaughter of journalists, the murders of cops, and the savage executions of Jewish shoppers in Paris last week are forcing the security and intelligence services in Europe and the United States to reexamine their assumptions about the threat of jihadi violence.
World 
ISIS & al Qaeda Killers Unite in Paris—and Beyond
MISGUIDED
Western intelligence officials are obsessed with tracking rival groups like ISIS and al Qaeda. They need to concentrate on tracking down the individual terrorists instead.
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