Many are speculating he was a "lone wolf." This term is generally used to denote plotters who have had no contact with any established terrorist organization. It can refer to a single individual plotting an attack like the Orlando shooter or multiple individuals plotting an attack like the married couple behind the San Bernardino attack. It's a bit of a misleading term because lone-wolf plotters can conspire in packs and are very seldom solitary. So it's worth asking whether the current threat wave against Europe is being driven by "lone-wolf terrorism."

Source: CNN March 23, 2017 23:07 UTC