Iran said on Monday US cyber attacks on its military had failed, as Washington sought to rally support in the Middle East and Europe for a hardline stance that has brought it to the verge of conflict with its long-time foe.
Last week the United States came as close as it has ever come to bombing Iran, when President Donald Trump aborted a retaliatory air strike just minutes before impact.
Trump said he decided the strike, to punish Iran for shooting down a drone, would have killed too many people.
The confrontation has escalated since May, when Washington sharply tightened economic sanctions on Iran, ordering all countries to halt imports of Iranian oil, in what the Trump administration says is an effort to force Tehran to open talks on its nuclear and missile programmes and regional behaviour.
In recent weeks, Washington has blamed Tehran for attacks on tankers in the Gulf, which Iran denies. Iran shot down the drone, saying it had flown over its air space. Washington says it was in international skies.
Washington seeks to rally its allies as Tehran says cyber attacks failed https://t.co/UADgb7KQ6W
— Reuters Iran (@ReutersIran) June 24, 2019
The United States, which accuses Iran of encouraging allies in Yemen to attack Saudi targets, is expected to announce another round of new sanctions this week.
US media have reported that Washington launched cyber attacks last week even as Trump called off his air strike. The Washington Post said on Saturday that the cyber strikes, which had been planned previously, had disabled Iranian rocket launch systems. US officials have declined to comment.
Fears of war
But Iran dismissed the cyber attacks as a failure.
"They try hard, but have not carried out a successful attack," Mohammad Javad Azari Jahromi, Iran's minister for information and communications technology, said on Twitter.
"Media asked if the claimed cyber attacks against Iran are true," he said. "Last year we neutralised 33 million attacks with the national firewall."
Allies of the United States have been calling for steps to defuse the crisis, saying they fear a small mistake by either side could trigger war.
"We are very concerned. We don't think either side wants a war, but we are very concerned that we could get into an accidental war and we are doing everything we can to ratchet things down," British Foreign Secretary Jeremy Hunt said.
US Secretary of State Mike Pompeo jetted to the Middle East to discuss Iran with the leaders of Saudi Arabia and the United Arab Emirates, two Gulf Arab allies that favour a hard line. Pompeo met King Salman as well as the king's son, de facto ruler Crown Prince Mohammed bin Salman.
Discussions focused on maritime security in the Gulf after the attacks on the tankers. "Freedom of navigation is paramount," Pompeo tweeted from Jeddah. Trump tweeted that other countries should do more to protect their own ships in a waterway guarded for decades by the US Fifth Fleet.
The US special representative for Iran, Brian Hook, visited Oman and was headed to Europe to explain US policy to allies. He told European reporters on a phone call ahead of his arrival that Trump was willing to sit down with Iran, but that Iran must do a deal before sanctions could be lifted.