Iran seized two container ships in the contested strait, state media said, further complicating diplomatic efforts to end the war that began Feb. 28.

Pakistan is the key broker in talks to end the U.S.-Israeli war with Iran. But it did not always get along with President Donald Trump and does not recognize Israel.

Iranian officials have threatened to forgo negotiations even as U.S. representatives plan to arrive in Pakistan for the meeting and a ceasefire is set to expire Wednesday.

India said it summoned Iran’s Ambassador in New Delhi, conveying concerns over “a shooting incident" in the strait involving two Indian-flagged ships. 

Tehran put limits on the Strait of Hormuz’s opening, as the United States issued a new sanctions exemption on the sale of Russian oil.

Even amid uncertainty over whether the truce would hold, many in Lebanon expressed relief at the prospect of quiet as aid groups mobilized help.

Iran has not confirmed Trump’s claim. Giving up its highly enriched uranium would be a major step toward an agreement.

President Donald Trump announced the agreement, which went into force Thursday evening, as Pakistani mediators worked to extend a U.S.-Iran ceasefire and arrange new talks.

Peace talks broke down over Iran’s nuclear program, which has survived two decades of international diplomacy seeking to curtail it and more than five weeks of bombing.

The blockade could derail a tenuous ceasefire after just five days. Vice President JD Vance said the U.S. remains open to diplomacy if Iran takes “our final and best offer.”

Vice President JD Vance was leading the highest level of face-to-face engagement between leaders of the United States and Iran in decades.

Amid allegations of bad faith and ceasefire violations from both Washington and Tehran, negotiators arrived in Islamabad for high-stakes talks.