TEHRAN (AFP) — Iran on Tuesday rejected Western calls to stand down its threat to retaliate against Israel for the killing of Hamas political leader Ismail Haniyeh in Tehran late last month.

The Islamic republic and its allies have blamed Israel for Haniyeh’s killing on 31 July during a visit to the Iranian capital for the swearing-in of President Masoud Pezeshkian. Israel has not commented.

Iran has vowed to avenge the death, which came hours after an Israeli strike in Beirut killed a senior commander of Hezbollah, the powerful Iran-backed militant group in Lebanon.

Western diplomats have scrambled to avert a major conflagration in the Middle East, where tensions were already high due to the Israel-Hamas war in Gaza.

In a statement on Monday, the United States (US) and its European allies urged Iran to de-escalate.

“We called on Iran to stand down its ongoing threats of a military attack against Israel and discussed the serious consequences for regional security should such an attack take place,” said the joint statement from Britain, France, Germany, Italy and the US.

The White House warned that a “significant set of attacks” by Iran and its allies was possible as soon as this week, saying Israel shared the same assessment.

The US has deployed an aircraft carrier strike group and a guided missile submarine to the region in support of Israel.

Iran’s foreign ministry spokesperson Nasser Kanani criticized the Western call for it to de-escalate.

“The declaration by France, Germany and Britain, which raised no objection to the international crimes of the Zionist regime, brazenly asks Iran to take no deterrent action against a regime which has violated its sovereignty and territorial integrity,” he said in a statement.

“Such a request lacks political logic, flies in the face of the principles and rules of international law, and constitutes public and practical support” for Israel.