US intelligence agencies have assessed with a high degree of confidence that the world's most wanted man was near Raqqa, Syria, when the missile struck, the officials said late Sunday.
Baghdadi's injuries were not considered life-threatening but they did mean he could not continue to command the daily operations of the group, said the officials.
However, it remains unclear whether Baghdadi was hit in a targeted attack or if he was part of "collateral damage".
The other factors that remain unclear are who fired the missile, the exact date of the strike or whether Baghdadi's injury was the result of a Russian missile.
IS has since released various audio messages it claims to be of Baghdadi.
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