Iran warned that its Gulf Arab rivals were jeopardising Lebanon's stability by blacklisting the leading force behind its government, Hezbollah, as a terror group.
Gulf countries declared Lebanon's Hezbollah a "terrorist" group, in the latest regional move against the Shia organisation fighting in support of Syria's regime.
More than 500 people, including dozens of civilians, have been killed since a major Russian-backed regime offensive in Syria's Aleppo province began this month, a monitor said.
Syrian government forces and allied fighters seized the town of Ataman near Deraa city on Friday, building on gains made last week in the southern province.
Bahrain said on Wednesday it had caught an Iranian-linked cell plotting attacks on its territory, days after it followed its close ally Saudi Arabia in cutting ties with Iran.
Hezbollah set off a bomb targeting Israeli forces at the Lebanese border on Monday in an apparent response to the killing in Syria last month of a prominent commander, triggering Israeli shelling of southern Lebanon.
Saudi Arabia's execution of a leading cleric from the Shia community has threatened to further intensify a wave of sectarian conflict in the region.
