That the actors in Europe’s three most recent big terror killings have been brothers radicalised in prison betrays the breeding ground for hard-line Islam that Europe’s jails have become. As the identities of the perpetrators of the latest terror killings in Europe became clear, so too did the past criminal history of the men involved. Brothers Ibrahim and Khalid el-Bakraoui had both done time for violent, but not politically motivated, crimes in the past. Ibrahim, who died first by detonating a suicide vest in the departures lounge at Brussels airport on Tuesday, had been sentenced to nine years in prison in 2010 for his part in an armed robbery, which involved shooting at police officers with an AK-47 rifle. His brother, who died shortly after by blowing himself up in a metro carriage in central Brussels, was given five years in 2011 for car-jacking and the possession of illegal weapons, again an AK-47. Although these men were Muslim then, the motivation for these crimes was self-enrichment, not religion. That motivation comes, according to a new report by the Investigative Project on Terrorism (IPT), from Jihad-factory prisons. This is a pattern of radicalisation they share with men involved with the Bataclan