A former Islamic State hostage revealed Sunday that ISIS held a group of Western hostages in a compound near Aleppo in northern Syria where its British militant "Jihadi John" staged mock executions to replicate the prison in Guantanamo, Cuba, for jihadist combatants. The ISIS terror group, also known as ISIL, held about 22 European, American and Latin American journalists and humanitarian workers in a village north of Aleppo and repeatedly subjected them to mock executions by three militant guards, former hostage Javier Espinosa, a Spanish journalist, wrote in El Mundo newspaper Sunday. The trio included "Jihadi John," who has appeared...