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 Foreign Minister Adel al-Jubeir said trade links with Iran
would be cut and air traffic links stopped.
But in an interview with Reuters news agency, Mr al-Jubeir also
said Iranian pilgrims travelling to holy sites in Mecca and Medina would still
be allowed to enter.
Saudi Arabia and Iran are respectively the key Sunni and Shia
powers in the region and back opposing sides in Syria and Yemen.
On Monday, a White House spokesman called on both countries to
"show some restraint and to not further inflame tensions that are on quite
vivid display in the region".
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