After a period of relative quiet, the Islamic State has been trying to increase its external attacks, according to U.S. counterterrorism officials.
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U.S. Says ISIS Was Responsible for Deadly Moscow Concert Hall Attack
After a period of relative quiet, the Islamic State has been trying to increase its external attacks, according to U.S. counterterrorism officials.
After a period of relative quiet, the Islamic State has been trying to increase its external attacks, according to U.S. counterterrorism officials.