Please answer the following question: What type of details about abu yusuf al-turki can be gathered from the following bio? Bio: Umit yasar toprak also known by his nom de guerre abu yusuf al-turki -lrb- the '' turk '' -rrb- was a renowned sniper within the al-nusra front who trained fighters on how to become snipers . he was also a member of the '' wolf unit '' , which was described as a unit of al-nusra front fighters -lrb- according to documents found by members of the dubai-based al aan tv station -rrb- . the wolf unit is reportedly another name for the khorasan group , though there are indications that the khorasan group may not exist as a separate entity from jabhat al-nusra . of turkish descent , al-turki lived in the turkish province of bursa , leaving behind five children so that he could fight for the al-nusra front . on 23 september 2014 , al-turki was killed during a series of a u.s.-led anti-khorasan group coalition airstrikes over syria .
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