TEHRAN — Iran on Monday denied US President Donald Trump's claim that new talks on ending their months-long conflict would begin on Monday.Speaking on board Air Force One on Sunday, Trump said Iran "knew the extent of the attack because they saw it forming", adding: "We're talking to them in the form of a negotiation. It begins tomorrow afternoon."In an earlier post on Truth Social, Trump said he had been asked by Iran and US allies in the Middle East to "hold off" as the "perimeters" of a deal had been agreed.But on Monday Iran's foreign ministry denied they were negotiating with the US, or that there were any plans to do so.Spokesperson Esmaeil Baghaei added that Tehran was negotiating with Oman to reach "an understanding over a path to ensure the security of shipping passage through the Strait of Hormuz".Earlier talks between the US and Iran have been facilitated through mediators.Pakistani government sources have said "no date or venue” has yet been finalized for the resumption of long-stalled direct talks between the US and Iran aimed at ending their months-long war.“There is no meeting (between US and Iranian negotiators) scheduled in Islamabad, at least in the next 24 hours,” a senior Pakistani official told Turkish news agency Anadolu on MondayThe official was responding to US President Donald Trump’s statement that new negotiations with Iran would begin Monday afternoon.Pakistani and Qatari mediators are in contact with Washington and Tehran to finalize a date and venue for the resumption of direct talks, the sources said.In his remarks on Air Force One, Trump declined to outline a deadline for a deal to be struck with Tehran, adding: "We'll just see how it is. We're ready to go anytime we want... I'm not looking to kill people."The US president did not specify where the talks on Monday would be held or who would attend.Islamabad and Doha are among the expected venues for the talks, according to the sources.Pakistani Interior Minister Mohsin Naqvi is expected to visit Tehran “in a day or two” to discuss matters related to reviving the talks, they said.Iran's semi-official Mehr news agency denied that Tehran had asked the US to hold off on further military action, saying Trump's claims were "nothing but a new lie".During his remarks on Air Force One, Trump said that the planned strikes would have been "the biggest attack since World War Two", and could have derailed prospects of a negotiated end to the months-long war.Trump declined to answer if he had been planning to strike Iranian energy infrastructure, which international law experts have said could constitute a war crime.Iran's acting Defence Minister Majid Ibn al-Reza earlier said Tehran viewed every threat from its adversaries as "real and credible" even if it formed part of psychological warfare."We will neither be caught off guard nor remain passive," he added.