A tanker sits anchored in the Strait of Hormuz off the coast of Qeshm Island, Iran, Saturday. (AP Photo/Asghar Besharati)

WASHINGTON (AP) — The United States said it forcibly seized an Iranian-flagged cargo ship that tried to get around a naval blockade near the Strait of Hormuz on Sunday, the first such interception since the blockade of Iranian ports began last week.

The news threw into question President Donald Trump’s earlier announcement that U.S. negotiators would head to Pakistan on Monday for another round of talks with Iran. A fragile ceasefire is set to expire by Wednesday, and Washington and Tehran remain in a standoff over the strait.

Trump on social media said a U.S. Navy guided missile destroyer in the Gulf of Oman warned the ship, the Touska, to stop and then “stopped them right in their tracks by blowing a hole in the engineroom.” U.S. Marines had custody of the U.S.-sanctioned vessel and were “seeing what’s on board!”

There was no immediate Iran comment. The U.S. Central Command said the destroyer had issued “repeated warnings over a six-hour period.”

There was no comment from Iranian officials on Trump’s announcement of the talks.

However, Iranian state media, without citing anyone beyond unnamed sources, issued brief reports suggesting that talks would not happen.

Minutes after the ship seizure was announced, Iranian state media reported on Iranian President Masoud Pezeshkian’s phone conversation with Pakistani Prime Minister Shehbaz Sharif earlier Sunday. Pezeshkian alleged bullying and unreasonable behavior by the United States, the reports said, and warned that U.S. actions have led to increased suspicion about the possibility that the U.S. will repeat previous patterns and “betray diplomacy.”

Separately, Pakistani Foreign Minister Ishaq Dar spoke by phone with Iran’s Foreign Minister Abbas Araghchi.

Pakistan did not confirm a second round of talks, but authorities began tightening security in Islamabad. A regional official involved in the efforts said mediators were finalizing preparations and U.S. advance security teams were on the ground. The official spoke on condition of anonymity because they weren’t authorized to discuss preparations with the media.

The White House said Vice President JD Vance, who led the first round of historic face-to-face talks over 21 hours last weekend, would lead the U.S. delegation to Pakistan with envoys Steve Witkoff and Jared Kushner.

Iran on Saturday said it had received new proposals from the United States. While Iran’s chief negotiator, parliament speaker Mohammed Bagher Qalibaf, said in an interview aired on state television late Saturday that “there will be no retreat in the field of diplomacy,” he acknowledged a wide gap remained between the sides.

It was unclear whether either side had shifted stances on issues that derailed the last round of negotiations, including Iran’s nuclear enrichment program, its regional proxies and control over the Strait of Hormuz.

Trump’s announcement on talks repeated his threats against Iranian infrastructure that have drawn widespread criticism and warnings of war crimes. If Iran doesn’t agree to the U.S.-proposed deal, “the United States is going to knock out every single Power Plant, and every single Bridge, in Iran,” he wrote.

Ships remained unable to transit the Strait of Hormuz amid threats from Iran and the U.S. blockade of ships heading to and from Iranian ports. Hundreds of vessels were waiting at each end for clearance.

One of the worst global energy crises in decades threatened to deepen. Roughly one-fifth of the world’s oil trade normally passes through the strait, along with critical supplies of fertilizer for the world’s farmers, natural gas and humanitarian supplies for places in dire need like Afghanistan and Sudan.