In early October, Matthew Barber, a scholar of Yazidi history at the University of Chicago, estimated between 3,000–5,000 Yazidi men had been killed by ISIL.
Pada awal bulan Oktober 2015, seorang sarjana sejarah Yazidi di perguruan tinggi Chicago bernama Matthew Barber menaksirkan bahwa sebanyak 3.000 hingga 5.000 orang Yazidi telah dibunuh NIIS.