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Islamic State confirmed on Thursday that its leader Abu Bakr al-Baghdadi was killed in a weekend raid by U.S. special forces in northwestern Syria, and vowed revenge against the United States. The Iraqi rose from obscurity to lead the ultra-hardline group and declare himself “caliph” of all Muslims, holding sway over huge areas of Iraq and Syria from 2014-2017 before Islamic State’s control disintegrated under U.S.-led attacks. The group confirmed his death in an audio tape posted online and said a successor, identified as Abu Ibrahim al-Hashemi al-Quraishi, had been appointed.