In Europe, most young terrorist suspect are radical Islamists. In the U.S., the problem is mostly with right-wing extremists.
One expert told me that, similar to how ISIS' caliphate was a main exporter of jihadism, the U.S. has become a main exporters of far-right ideology
Terrorists in Europe are becoming younger and harder to find. My story about how the process of radicalization - of religious as well as right wing extremists - has sped up, and mostly happens at home, online.
wsj.com/world/europe/teenage…