Iran will treat any attack “as an all-out war against us,” a senior Iranian official said on Friday, ahead of the arrival of a US military aircraft carrier strike group and other assets in the Middle East in the coming days.

“This military buildup — we hope it is not intended for real confrontation — but our military is ready for the worst-case scenario. This is why everything is on high alert in Iran,” said the senior Iranian official, speaking on condition of anonymity.

“This time we will treat any attack — limited, unlimited, surgical, kinetic, whatever they call it — as an all-out war against us, and we will respond in the hardest way possible to settle this,” the official said.

US President Donald Trump said on Thursday that the United States had an “armada” heading toward Iran but hoped he would not have to use it, as he renewed warnings to Tehran against killing protesters or restarting its nuclear program.

“If the Americans violate Iran’s sovereignty and territorial integrity, we will respond,” said the Iranian official. He declined to specify what an Iranian response might look like.

“A country under constant military threat from the United States has no option but to ensure that everything at its disposal can be used to push back and, if possible, restore balance against anyone who dares to attack Iran,” the official said.

The US military has, in the past, periodically sent increased forces to the Middle East at times of heightened tensions, moves that were often defensive.

However, the US military staged a major buildup last year ahead of its June strikes against Iran’s nuclear program.

Air France suspends service to Dubai as KLM halts Middle East flights

At least two European airlines suspended flights to cities in the Middle East on Friday, with Air France saying it will temporarily stop service to Dubai due to the geopolitical situation.

Dutch airline KLM also halted flights until further notice to cities in the Middle East and would not fly through the airspace of several countries in the region, including Iraq and Iran, according to the Netherlands’ state broadcaster.

“Due to the current situation in the Middle East, the company has decided to temporarily suspend its service to Dubai,” France’s national carrier said in a statement to AFP.

The airline added it was “constantly monitoring the evolution of the geopolitical situation in the territories served and overflown by its aircraft” to ensure “the highest level of safety and security” for its flights.

“Air France is monitoring the situation in real time and will provide further updates on its flight schedule,” the French airline said.

KLM told Dutch public broadcaster NOS on Friday that it had suspended flights until further notice to Tel Aviv, Dubai, Dammam and Riyadh and would not fly through the airspace of Iraq, Iran, Israel and several countries in the Gulf.

The airline did not disclose the reason for the suspensions and said it was in touch with Dutch authorities, according to NOS.

Trump has repeatedly threatened US strikes on Iran over the crackdown on the protest movement that recently erupted across the Islamic republic.

The prospect of military action appeared to recede last week after the White House said Tehran had halted planned executions of demonstrators, but Trump on Thursday confirmed continuing military preparations.

“You know we have a lot of ships going that direction, just in case… We have a big force going toward Iran,” he said.