Tehran, Iran - Iran's Islamic Revolutionary Guards threatened Saturday to target US sites in the Middle East if its tankers come under fire, Iranian media reported, as Washington was left waiting for Tehran's response to its latest negotiating position.
"Any attack on Iranian tankers and commercial vessels will result in a heavy attack on one of the American centers in the region and enemy ships," the Guards said, a day after US strikes on two Iranian tankers in the Gulf of Oman.
US President Donald Trump had said on Friday he was expecting Iran's answer to Washington's latest proposal for a peace deal "supposedly tonight."
But if Tehran sent Pakistani mediators a response, there was no public sign of it, and Iran's Foreign Minister Abbas Araghchi reportedly questioned the reliability of US leadership.
"The recent escalation of tensions by American forces in the Persian Gulf and their numerous actions in violating the ceasefire have added to suspicions about the motivation and seriousness of the American side in the path of diplomacy," he said in a call with his Turkish counterpart, according to Iran's ISNA news agency.
On Friday, a US fighter jet fired on and disabled two Iranian-flagged tankers that Washington accused of challenging its blockade of Iran's ports. An Iranian military official told local media the navy had responded with strikes.
That incident followed another flare-up the night before in the Strait of Hormuz, the vital international sea lane that Iran is seeking to control in order to extract tolls and wield economic leverage over the US and its allies.
The US says it is unacceptable for Tehran to control the key oil route.
Washington has sent Iran, via Pakistani mediators, a proposal to extend the truce in the Gulf to allow for talks on a final settlement of the conflict, launched 10 weeks ago with US-Israeli strikes on Iran.
A reporter for French broadcaster LCI, Margot Haddad, said Saturday that Trump had told her in a brief interview he still expected to find out Iran's answer "very soon."
Iran's foreign ministry spokesperson said Friday the proposal was still "under review."
Apparent oil slick spreads off Iran's Kharg Island
Top US diplomat Marco Rubio met Saturday with the leader of Qatar, a key intermediary for Washington in dialogue with Iran, discussing "continued close coordination to deter threats and promote stability and security across the Middle East," the State Department said.
Qatar's Sheikh Mohammed bin Abdulrahman Al Thani met the previous day with US Vice President JD Vance to discuss the Pakistani-led efforts to broker a permanent peace.
Iran has attacked sites in Qatar during the war, pointing to the wealthy emirate's role as host of a major US air base.
Meanwhile, satellite images have shown an apparent oil slick spreading off the coast of Iran's Kharg Island, a key oil export terminal for the Islamic republic.
It was not immediately clear what caused the apparent spill, which was off the island's west coast and appeared to cover more than 20 square miles, according to global monitor Orbital EOS.
A UK-based non-governmental organization, the Conflict and Environment Observatory, told AFP that by Saturday the slick was "much reduced" and may have been caused by leaking oil infrastructure.
Kharg Island is at the heart of Iran's oil export industry, a lynchpin of its economy, and lies in the Gulf far north of the narrow Strait of Hormuz.
Following the start of the war on February 28, Iran largely closed the strait, throwing global markets into turmoil and driving up oil prices.
The US later imposed its own blockade of Iranian ports in response, and Trump this week abandoned a short-lived US naval operation to reopen the strait to commercial shipping.