But new data shows that European authorities aren’t just guarding against terror plots using weapons like trucks or bombs. They are also concerned about a more conventional threat: illegal firearms that may be increasingly easy for suspected terror networks to obtain.

According to the International Center for the Study of Radicalization and Political Violence at King’s College London, criminals-turned-terrorist suspects are becoming a more common problem. The research center collected extensive data on 79 recent European militants with criminal pasts. About 80 percent of those involved in recent terrorism plots had criminal convictions.

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