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By Stephanie Nebehay GENEVA (Reuters) - Islamist fighters have carried out atrocities on "an unimaginable scale" in months of fighting with Iraqi forces who have also killed detainees and shelled civilian areas, a U.N. official said in an emergency debate on the conflict on Monday. Iraq's human rights minister, Mohammed Shia' Al Sudani, told the session that Islamic State militants, "oozing with barbarity", threatened his country and the world, but did not immediately respond to allegations against state troops. Islamic State has grabbed large areas of Iraq and neighboring Syria, declaring a cross-border caliphate and driving hundreds of thousands from their homes. At least 1,420 people were killed in Iraq in August alone, U.N. figures showed on Monday.