For months now, Western counterterrorism experts have sounded the alarm: as ISIS loses ground, foreign fighters from America and Europe may try returning home. When they do, the experts cautioned, they will carry the terror threat with them, ready and willing to strike. Law enforcement needs to be prepared.
Now, with the fall of the Iraqi city of Harija, the Islamic State’s last major stronghold, and the impending collapse of its Syrian capital, Raqqa, the time has finally come. But is law enforcement prepared?