
There have been persistent rumors that ISIS chief Abu Bakr al-Baghdadi has died several times. (File)

The Syrian army has active front lines with ISIS in Raqqa province and has made recent gains there (Reuters File)

Abu Bakr al-Baghdadi has been killed or gravely injured at least a half-dozen times since 2014

Still image taken from video shows destroyed Grand al-Nuri Mosque of Mosul in Iraq where ISIS chief declared himself "commander of the faithful"
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