Iran's foreign ministry on Thursday warned arch-foe Israel not to take military action against the Islamic republic after it threatened Tehran over a deadly tanker attack.
"In another brazen violation of Int'l law, Israeli regime now blatantly threatens Iran with military action," ministry spokesman Saeed Khatibzadeh said on Twitter.
The MT Mercer Street, managed by prominent Israeli billionaire Eyal Ofer, was attacked off Oman last week.
A British security guard and a Romanian crew member were killed in what the United States, Britain and the vessel's operator Zodiac Maritime said appeared to be a drone strike.
Khatibzadeh's comments came after Defense Minister Benny Gantz earlier on Thursday called Iran a threat to the country, the Middle East and the entire world and warned that Israel was prepared to take action to counter it.
"Iran seeks to pose a multi-front challenge to Israel, as such is building up its forces in Lebanon and Gaza, deploying militias in Syria and Iraq and maintaining its supporters in Yemen. Iran is a global and regional problem and an Israeli challenge," he said told Ynet.
When pressed if Israel was ready to take military action against Iran, Gantz said: "Yes."
On Tuesday, Prime Minister Naftali Bennett said that his government was "working on enlisting the world" in response to the attack but warned, "we also know how to act alone".
"The Iranians need to understand that it is impossible to sit peacefully in Tehran and from there ignite the entire Middle East. That is over," he said.
Both the United States and Israel have said their intelligence assessments of the July 29 incident concluded that an Iranian drone attacked the ship, charges Iran denies.
"We state this clearly: ANY foolish act against Iran will be met with a DECISIVE response," Khatizbadeh said.
"Don't test us," he warned.
There have been several reported attacks on Iranian ships in recent months that Tehran has linked to Israel.
In March, Iran said it was "considering all options" after an attack on a cargo ship in the Mediterranean that it blamed on Israel.
In April, Tehran said its freighter Saviz was hit by an "explosion" in the Red Sea, after media reports said Israel had targeted the ship.
The New York Times reported that it was an Israeli "retaliatory" attack, after "Iran's earlier strikes on Israeli ships".
Iran has also accused Israel of sabotaging its nuclear sites and killing a number of its scientists.