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Lebanon has been thrust to the centre of regional rivalry between Saudi Arabia and Iran since the Saudi-allied Lebanese politician Saad al-Hariri quit as prime minister on Saturday, citing Iran's "grip" on the country and threats to his life.
Saudi Gulf affairs minister Thamer al-Sabhan said the Lebanese government would "be dealt with as a government declaring war on Saudi Arabia" because of what he described as aggression by Hezbollah.
Faulting the Hariri-led administration for failing to take action against Hezbollah during a year in office, Sabhan said "there are those who will stop (Hezbollah) and make it return to the caves of South Lebanon".
In an interview with Al-Arabiya TV, he added: "Lebanese must all know these risks and work to fix matters before they reach the point of no return."
He did not spell out what action Saudi Arabia might take against Lebanon, a weak and heavily indebted country that is still rebuilding from its 1975-90 civil war and where one-in-four people is a Syrian refugee.
There was no immediate comment from the Lebanese government.
Hezbollah is both a military and a political organisation that is represented in the Lebanese.
Its powerful guerrilla army is widely seen as stronger than the Lebanese army, and has played a major role in the war in neighbouring Syria, another theatre of Saudi-Iranian rivalry where Hezbollah has fought in support of the government.
Hariri cited a plot to assassinate him during his unexpected resignation speech broadcast from Saudi Arabia which caught even his aides off guard. He also slammed Hezbollah and Iran, accusing them of sowing strife in the Arab world.
Hezbollah leader Sayyed Hassan Nasrallah has said he will not comment on Hariri's speech, calling it a "Saudi statement" and saying Riyadh had forced Hariri to resign.
The sudden nature of Hariri's resignation generated speculation in Lebanon that his family's Saudi construction business had been caught up in an anti-corruption purge and he had been coerced into resigning.
Saudi Foreign Minister Adel Jubeir said it was "nonsense" to suggest Hariri had been coerced into quitting.
Hariri had quit because Hezbollah had been "calling the shots" in the government, he said. Hariri, a Saudi citizen, was free to leave the country at any time, he said.
Hariri flew to Saudi Arabia on Friday.