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Abu Yusaf is a high-level security commander in ISIL. According to an interview conducted with The Washington Post, Abu Yusaf is a nom-de-guerre of a 27-year-old European Islamist who joined ISIS in 2013.[when?]
- "The terrorists fighting us now? We just finished training them". Washington Post. Retrieved 28 December 2014.
- "In Turkey, a late crackdown on Islamist fighters". Washington Post. Retrieved 28 December 2014.