A number of Saudi Arabia's allies have joined diplomatic action against Iran after the Saudi embassy in Tehran was attacked amid a row over the execution of a Shia Muslim cleric.
Bahrain and Sudan have both severed relations with Iran, and the UAE has downgraded its diplomatic team.
Saudi Arabia on Sunday severed ties and gave Iran's diplomats two days to go.
Saudi Arabia and Iran are the key Sunni and Shia powers in the region and back opposing sides in Syria and Yemen.
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Saudis beheaded 48 people including a shia cleric.
Now they and their allies have cut ties with Iran.
Is 2016 the year Iran gets democracy?