UN Secretary General Antonio Guterres has urged Donald Trump not to walk away from an international deal designed to prevent Iran acquiring nuclear weapons.
Speaking to the BBC, Mr Guterres said there was a real risk of war if the 2015 agreement was not preserved.
Mr Trump has been a strong critic of the accord, in which Iran agreed to limit its nuclear programme in return for the lifting of sanctions.
The US president has until 12 May to decide whether to stick with the deal.
Mr Guterres told the BBC that the Iran agreement was an “important diplomatic victory” and should be maintained.
“We should not scrap it unless we have a good alternative,” he said, adding: “We face dangerous times.”
It comes just days after Israel revealed “secret nuclear files” accusing Iran of having covertly pursued nuclear weapons.
US Secretary of State Mike Pompeo said the files provided proof that the Obama-era nuclear deal was “built on lies”.
European allies France, the UK and Germany meanwhile have agreed that pursuing the current nuclear deal with Iran is the best way to stop it developing nuclear weapons.
Iranian President Hassan Rouhani has questioned the legitimacy of efforts by the US and France to change the nuclear deal with his country.
Mr Rouhani has said that Mr Trump has no “right” to renegotiate the seven-party agreement.
He has said Iran “will not accept any restrictions beyond its commitments” to comply with international rules in the years ahead.
Mr Rouhani has also accused Mr Trump of “maliciously violating” the nuclear agreement.
Iran maintains that the missiles it has tested are not designed to carry nuclear warheads and insists its nuclear programme is a peaceful one for energy purposes. -BBC
