"I make a very serious statement about defending our country".
During an interview with CNN, Zarif declared that "any USA or Saudi military strike on Iran will result in an all-out war".
Yemen's Iran-backed Houthi rebels quickly claimed responsibility for the attack, but Secretary of State Mike Pompeo said it was "abundantly clear" Iran was responsible for the attack, an accusation Tehran denied.
The attack has reignited fears over a wider conflagration in the region, as tensions remain high over Iran's collapsing nuclear deal with world powers. "It was an act of war against them directly", he told reporters before meeting Saudi Crown Prince Mohammed bin Salman. We'd like a peaceful resolution.
Trump's decision not to retaliate against Iran drew criticism from Republican hawks like Senator Lindsey Graham who said that USA inaction "was clearly seen by the Iranian regime as a sign of weakness". But we won't blink to defend our territory.
A Saudi-led coalition has battled the Houthis since March 2015 in a bloody and stalemated war.
The United Nations said Thursday that experts had arrived in Saudi Arabia to investigate Saturday's attack, "at the invitation of the Saudi authorities". The state-run WAM news agency quoted Mr Salem al-Zaabi of the Emirati Foreign Ministry as saying the UAE joined the coalition to "ensure global energy security".
The Huthis have however previously hit dozens of targets in Saudi Arabia, and their rapidly advancing arsenal has exposed the kingdom's vulnerability despite its vast military spending. Australia, Bahrain and Britain are also taking part. Regardless of whether Tehran and Washington finally strike a deal, making good on such threats is critical to Iran's strategy, given that the country must demonstrate to any USA president that it can and will engage in aggressive action if the United States breaks a bilateral deal.
Iran Envoy: 'All-Out War' to Result if Hit for Saudi Attack
An investigation into the origin of the attacks was still under way and the result will be announced later, he said. Secretary of State Mike Pompeo said the attacks would be a major focus of next week's annual U.N.
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"The attack was launched from the north and unquestionably sponsored by Iran", said the official, Colonel Turki al-Malki.
Mr Trump stopped short of directly accusing the Iranian government of being behind the attack, but he did confirm a retaliatory attack was on the table.
Gen. Kenneth Mackenzie, the head of U.S. Central Command, has requested more air defense units but the White House has not yet decided whether to approve the request, officials said.
A forensic team from US Central Command is poring over evidence from cruise missile and drone debris, but the Pentagon said the assessment is not finished.
US efforts to bring about a UN Security Council response looked unlikely to succeed as Russian Federation and China have veto powers and were expected to shield Iran.
Both Saudi and USA officials have said the attack was too sophisticated for the Houthis to have carried it out.
US Secretary of the Treasury Steven Mnuchin said the latest sanctions action against Tehran was 'very big' and that it affected the last source of funds for Iran. Trump had even mulled whether to back a French proposal to grant Iran a $15 billion credit line, although he may have conditioned it on securing a meeting with Iranian President Hassan Rouhani, who has refused to meet the US president unless Washington eases sanctions first.
Most Trump critics applauded USA restraint, claiming that the United States had under no obligation to Riyadh, but blamed Trump's rhetorical bluster and his policy of "maximum pressure" on Iran for driving the region to the brink of conflict.
France has said the NY gathering presented a chance to de-escalate tensions.