An explosion in Kobani, Syria, during fighting between Kurdish and Islamic State fighters in October 2014. Researchers found a spike in the formation of small online groups connected to the Islamic State before the attack began in September of that year.
Credit: Sedat Suna/European Pressphoto Agency
After Orlando and San Bernardino and Paris, there is new urgency to understand the signs that can precede acts of terrorism.
From The New York Times View Full Article
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