Terror in Europe

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Now not all warfare was cyber warfare in 2016. With the battle on to retake Mosul in Iraq and Raqqa in Syria from the Islamic State, the so-called Caliphate is shrinking and intelligence officials warned that European extremists will be returning to their home countries. This October, we spoke with ProPublica's senior reporter Sebastian Rotella about his series "Terror in Europe" for PBS' Frontline.




Warren Olney