"Daesh is genocidal by self-proclamation, by ideology and by actions, in what it says, what it believes and what it does," Secretary of State John Kerry said.
"Daesh is also responsible for crimes against humanity against these same groups," he added, using the US government's preferred term for the group.
Majority of militants fleeing Pakistan joined Islamic State in Afghanistan: Afghan envoy
Washington's senior diplomat made the ruling after the US Congress voted to designate the militant group's murders of religious minorities genocidal, a move which has international legal implications.
The United States is already leading a coalition of Western and Arab allies to strike IS targets from the air and to support Iraqi government and Kurdish and Syrian militia forces against the group.
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