ISIS leader Abu Yusif has been killed in a precision strike carried out by US authorities inside Syria - nearly two weeks after Bashar al- Assad 's government fell. US Central Command (CENTCOM) announced the killing in a statement this afternoon in which it revealed it was able to carry out the strike thanks to Assad's departure nearly two weeks ago. The organisation said Abu Yusif, also known as Mahmud, was killed in the Dayr az Zawr Province, Syria, on December 19, and that he was one of two