US Secretary of State John Kerry declared IS, which he called Daesh, as "genocidal by self-proclamation, by ideology and by actions".
Mr Kerry also said the group was responsible for crimes against humanity and ethnic cleansing.
Islamic State (IS) has been accused of mass killings and other atrocities in areas it controls in Syria and Iraq.
US declares so-called Islamic State `committed genocide`
18 March 2016
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The US says the Islamic State (IS) group has committed genocide against Yazidis, Christians and Shia Muslims.
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