Amid ISIS' defeat in the Iraqi city of Mosul and ongoing fighting in its self-declared capital in Raqqa, Syria, the fate of its leader, Abu Bakr al-Baghdadi, remains unknown.
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Mattis on ISIS leader Baghdadi: 'Until I see his body, I am going to assume he is alive'
Russia has admitted it has no proof the ISIS leader is dead, and US officials are in wait-and-see mode.
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Russia said in late June that it believed he had been killed in a bombing raid on Raqqa, but earlier this week Moscow admitted that it was unable to confirm the death and said it was getting contradictory information.
Despite an observer group saying Baghdadi has been killed, Defense Secretary James Mattis and other US commanders are skeptical.
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