Iran’s president on November 28 accused arch-foe Israel of acting as a US “mercenary” and seeking to create chaos, vowing Tehran would avenge the assassination of a top Iranian nuclear scientist.

The Islamic republic’s supreme leader Ayatollah Ali Khamenei called for the perpetrators to be punished, while President Hassan Rouhani stressed the country would seek its revenge in “due time” and not be rushed into a “trap”.

Mohsen Fakhrizadeh, dubbed by Israel as the “father” of Iran’s nuclear programme, died on November 27 after being seriously wounded when assailants targeted his car and engaged in a gunfight with his bodyguards outside Tehran, according to Iran’s defence ministry.

The assassination comes less than two months before US President-elect Joe Biden is due to take office, after a tumultuous four years of hawkish foreign policy in the Middle East under President Donald Trump.

“They are thinking of creating chaos, but they should know that we have read their hands and they will not succeed,” Rouhani said.

He pinned the blame for the killing on “the wicked hands of the global arrogance, with the usurper Zionist regime as the mercenary”.

Iran generally uses the term “global arrogance” to refer to the US.

Students vented their anger by calling for revenge and burning US and Israeli flags outside Iran’s foreign ministry in Tehran, as well as pictures of Trump and Biden.

Trump unilaterally withdrew in 2018 from a multilateral nuclear deal with the Islamic republic, which sought to contain its atomic ambitions, and has re-imposed crippling sanctions. But Biden has signalled his administration may be prepared to rejoin the accord.

The Iranian president added: “This barbaric assassination shows that our enemies are in stressful weeks, during which they feel . . . their pressure declining, the global situation changing.

“The nation of Iran is smarter than to fall in the trap of the conspiracy set by the Zionists.”

The US slapped sanctions on Fakhrizadeh in 2008 for “activities and transactions that contributed to the development of Iran’s nuclear programme”, and Israeli Prime Minister Benjamin Netanyahu once described him as the father of Iran’s nuclear weapons programme.

Iran has repeatedly denied seeking to develop nuclear weapons.

The New York Times said a US official and two other intelligence officials confirmed Israel was behind the attack, without giving further details.

“Iran’s enemies should know, that the people of Iran and officials are braver than to leave this criminal act unanswered,” Rouhani said.

“In due time, they will answer for this crime.”

Khamenei called for “punishing the perpetrators and those responsible”, in a short statement on his official website, urging that Fakhrizadeh’s “scientific and technical efforts . . . in all of the fields he was working in” should be continued.

Former CIA director John Brennan warned the assassination risked sparking a wider conflagration in the Middle East.