The US has not commented on the alleged message Iran had sent.

CNN reported that the US is on high alert and is preparing for a “significant” response from Iran against Israeli or American targets in the region. The network cited an unnamed US official.

NBC, citing two unnamed United States officials, said US President Joe Biden’s administration is concerned any attack could be inside Israel, specifically against “military or intelligence targets, rather than civilians”.

The Biden administration did take the unusual step of communicating directly to Iran that the US was unaware Monday’s strike in Damascus would happen, Bloomberg reported. That suggested the US was trying to prevent its own forces and bases in the Middle East being attacked.

The Islamic Republic has said it will deliver a “slap” to Israel, its arch enemy. Still, it is unclear when that would happen or whether Iran would try to attack Israel directly or through one of its proxy groups such as Hezbollah, based in Lebanon.

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The air strike hit the Iranian consulate in Damascus, killing at least seven Iranians, including two generals. While Israel has repeatedly targeted Iran-linked assets in Syria over the past few months, this was the first time an attack struck an Iranian diplomatic building.

Israel has been on alert since then, cancelling home leave for combat troops, calling up reserves and bolstering air defences.

Its military scrambled navigational signals over Tel Aviv on Thursday to disrupt GPS-navigated drones or missiles that might be fired at the country.

Speaking to Israeli forces at an airbase on Friday, Defence Minister Yoav Gallant said Israel was attacking enemies wherever it decided to do so.

“It could be in Damascus and it could be in Beirut,” he said. “The enemy is badly hit in all places and is therefore looking for ways to respond. We are ready with a multilayered defence.”

Hezbollah’s leader, Hassan Nasrallah, on Friday said a response from Iran is undoubtedly coming. But, he said, his group will not “interfere in such decisions”.

“And after that, how Israel will behave, the region would enter in a new phase,” Nasrallah said in a televised Quds Day speech.

Nasrallah, who lives in hiding, highlighted the coordinated work of Iran’s so-called resistance groups in the region.

Hezbollah, the Middle East’s most powerful militia, said the group has not used “its primary arsenal” in the daily skirmishes with Israel along the southern border of Lebanon since the start of the Israel-Gaza war on October 7.

“We have not employed our main weapons yet, nor have we used our main forces,” he said.

Hezbollah is “completely prepared and ready” for any war with Israel, Nasrallah said.

“If they (Israelis) want a war, we say to them … welcome.”

Nasrallah reiterated his stance that the Lebanese front near the Israeli border in south Lebanon is linked to the Gaza war. “When the war stops in Gaza it will stop here,” he added.

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Hezbollah said on Friday that three of its fighters had been killed in exchanges with Israel. Its ally Amal said it had also lost three fighters to an air strike in southern Lebanon.

The Israeli army said in a communique that it had bombed a “military complex” used by Amal and targeted several regions of southern Lebanon.

A military spokesman posted on X, formerly Twitter, that Israel’s air force had struck Hezbollah infrastructure.

Quds Day solidarity rallies with the Palestinians were held across the region.

Hundreds marched in Yarmuk refugee camp in Damascus, including members of Islamic Jihad, many chanting “Jerusalem we are coming”.

In Baghdad, pro-Iran groups organised a rally that drew around 2,000 people who gathered on Palestine Street chanting: “No to America, No to Israel.”

An Israeli flag was painted on the ground so that protesters could trample it.

Additional reporting by Agence France-Presse