At least two merchant vessels reported ​they were hit by gunfire as they attempted to cross the Strait of Hormuz on Saturday, three maritime security and shipping sources said, shortly after Iran said it was once more ‌tightening control of the waterway.

Some merchant vessels received a radio message from Iran’s Navy that the vital energy chokepoint was shut again and no ships were allowed to pass through, shipping sources said.

Earlier maritime trackers showed a convoy of eight tankers transiting the waterway in the first major movement of ships since the US-Israeli war on Iran began seven weeks ago.

But Iran then said it was reimposing strict military controls on the narrow route, the conduit before the war of about a fifth of global oil trade, as the US maintained its ​blockade of Iranian ports.

And in a defiant message posted on his Telegram channel, Iran’s Supreme Leader Mojtaba Khamenei said Iran’s navy was ready to inflict “new bitter defeats” on its enemies.

Tough Messaging from Iran

Iran’s renewed tough ​messaging injected fresh uncertainty around the Iran conflict, raising the risk that oil and gas shipments through the Strait could remain disrupted just as Washington weighs whether to extend a fragile ceasefire.

US President Donald Trump hours earlier had cited “some pretty good news” about Iran, declining to elaborate. But he also said fighting might resume without a peace deal by Wednesday, when the two-week ceasefire expires.

Iran had announced ​its temporary reopening of the Strait of Hormuz following a separate US-brokered 10-day ceasefire agreement on Thursday between Israel and Lebanon. Israel invaded parts of southern Lebanon after the Iran-allied Hezbollah militant group joined the fighting in early March.

But on Saturday ​Iran’s armed forces command said transit through the strait had reverted to a state of strict Iranian military control, citing what it described as repeated US violations and acts of “piracy” under the guise of a blockade.

The spokesperson said Iran had earlier agreed, “in good faith,” to the managed passage of a limited number of oil tankers and commercial vessels following negotiations, but said continued US actions had forced Tehran to restore tighter controls on shipping through the strategic chokepoint.

Unclear if any direct talks this weekend

The war with Iran, which began on February 28 with a US-Israeli attack on the Islamic Republic, has killed thousands, spread to Israeli attacks in Lebanon and sent oil prices surging because of the de facto closure ​of the strait.

Despite the initial movement of ships, prospects remained unclear on a resumption of high-level US-Iran talks or any agreement over Iran's nuclear ambitions, a key sticking point.

“It seems to be going very well in the Middle East with Iran,” Trump told ‌reporters on Air Force One while returning to Washington from Phoenix, Arizona, on Friday. “We’re negotiating over the weekend. I expect things to go well. Many of these things have been negotiated and agreed to.

“The main thing is that Iran will not have a nuclear weapon. You cannot let Iran have a nuclear weapon, and that supersedes everything else.”

But in sharp contrast, Trump also said he might end the ceasefire with Iran unless a long-term deal to end the war was agreed before it expires on Wednesday, adding that a US blockade of Iranian ports would continue.

Pressure for a way out of the war has mounted as Trump’s fellow Republicans defend narrow majorities in Congress in the November midterm elections with US ​gasoline prices high, inflation rising and his own approval ratings down.

Trump ​has told Reuters there would probably be more ⁠direct talks between Iran and the US this weekend.

Some diplomats said that was unlikely given the logistics of gathering in Islamabad, where the talks are expected to take place.

There were no signs of preparations early on Saturday for talks in the Pakistani capital, where the highest-level US-Iran negotiations since the 1979 Islamic Revolution ended without agreement last weekend.

The ​key Pakistani mediator, army chief Field Marshal Asim Munir, has concluded three days of talks in Tehran, the Pakistani military said. Pakistani Prime Minister Shehbaz Sharif was ​also returning to Islamabad after talks ⁠this week in Qatar, Saudi Arabia and Turkey.

A Pakistani source aware of mediation efforts said a meeting between Iran and the US could produce an initial memorandum of understanding, followed by a comprehensive peace agreement within 60 days.

No clarity on Iran’s Nuclear Programme

Differences remained over Tehran’s nuclear programme, which has been a sticking point in peace talks, with Iran defending its right to what it says is a civilian nuclear energy programme.

Trump told Reuters the US would remove Iran's stockpiles of enriched uranium. Iran’s foreign ministry ​spokesperson told state TV the material would not be transferred anywhere.

Separately, a senior Iranian official said Tehran hoped a preliminary agreement could be ​reached in the coming days.

Oil prices , fell about 10 percent and global stocks jumped on Friday on the prospect of marine traffic resuming through the strait.

At last weekend’s talks, the US proposed a 20-year suspension of all Iranian nuclear activity, while Iran suggested a halt of three to five ​years, according to people familiar with the proposals.

Two Iranian sources have said there were signs of a compromise that could remove part of the stockpile.