At least 20 fighters were killed in clashes in eastern Libya between Islamic State and another Islamist force that later declared jihad against its hardline rival, residents and medical sources said on Wednesday.
Fighting erupted in the city of Derna after a leader in the Islamist umbrella group Majlis al-Shura was killed, apparently for refusing to swear allegiance to Islamic State's leader Abu Bakr al-Baghdadi, according to residents.
Islamic State and other Islamist groups have thrived in Libya since two governments began fighting for control of the oil producer, leaving the country in a security vaccum four years after the ousting of Muammar Gaddafi.
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