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Israel's military has put soldiers on "high alert for an attack" and told them to be ready for "all scenarios" after identifying “irregular activity of Iranian forces in Syria”.

Local authorities in the Israeli-held Golan Heights have been ordered to “unlock and ready [bomb] shelters” in anticipation of an imminent attack.

“The IDF is ready and prepared for a variety of scenarios and warns that any action against Israel will be answered with a fierce retaliation,” The Israel Defense Forces (IDF) said in a statement.

The warning about a potential strike came just moments before US President Donald Trump unveiled his decision to pull of the Iran nuclear deal.

On Monday, Iran’s army chief of staff warned that the regime would respond to any Israeli aggression when the time is right.

“If the enemy casts a covetous eye on our interests or conducts [even] a slight act of aggression, the Islamic Republic will give an appropriate response at an appropriate time,” General Mohammad Bagheri, state media Press TV reported.

(Image: DS)

Iran has vowed to take revenge on Israel for an airstrike on one of its military bases that killed seven people in April 9.

On Sunday, Israeli defense officials warned that Iran was planning to retaliate for recent deadly airstrikes in Syria.

The IDF said its defence forces in northern Israel have been put into a state of "high preparedness".

Footage shows troops setting up the Iron Dome, Patriot, and Arrow missile defense systems.

Residents in the Golan Heights have been ordered to listen to security instructions.

(Image: IDF) (Image: IDF)

In a separate development, Israel's military said reservist forces are being called up.

"We are drafting reservists in specific cases, as required," a military spokeswoman said, without elaborating on the scale of the call-up.

Trump's bombshell decision to pull out of an international deal intended to prevent Iran from developing nuclear weapons could prove to be another flash point between Israel and Iran.

Israeli Prime Minister Benjamin Netanyahu praised Trump for withdrawing from the Iran nuclear deal, saying it had been a "recipe for disaster".

The Israeli leader, who long called for the deal between Western powers and Iran to be fixed or cancelled, spoke moments after Trump announced his decision in a speech at the White House.

He hailed Trump for making an "historic move", thanking him for "his commitment to ensure that Iran never gets nuclear weapons".

Trump said he was reimposing economic sanctions on Iran and pulling the US out of the agreement, which is aimed at stopping Tehran from obtaining a nuclear bomb.

The decision is likely to raise the risk of conflict in the Middle East.

Iran dismissed allegations it is developing nuclear weapons in breach of the deal as Netanyahu "crying wolf".