Iran said it fully reopened the Strait of Hormuz to commercial vessels, but questions lingered Saturday about how much freedom ships actually had to transit the waterway as Tehran maintained its grip on the who got through and threatened to close it again if the U.S. kept in place its blockade of Iranian ships and ports.

Iran’s Friday announcement about the opening of the crucial body of water, through which 20% of the world’s oil is shipped, came as a 10-day truce between Israel and the Iranian-backed Hezbollah militant group in Lebanon appeared to hold.

U.S. President Donald Trump, meanwhile, said the American blockade “will remain in full force” until Tehran reaches a deal with the U.S., including on its nuclear program.

Asked by a reporter Friday night what he will do if there’s no deal when the ceasefire expires next week, Trump said, “I don’t know. ... But maybe I won’t extend it, so you’ll have a blockade and unfortunately we’ll have to start dropping bombs again.” But he also told reporters accompanying him aboard Air Force One to Washington that a deal is “going to happen,” and flatly rejected the idea of restrictions or tolls by Iran on the Strait of Hormuz.

Trump had earlier celebrated the Iranian announcement, posting on social media that the strait was “fully open and ready for full passage.” But minutes later, he issued another post saying the U.S. Navy’s blockade would continue “UNTIL SUCH TIME AS OUR TRANSACTION WITH IRAN IS 100% COMPLETE.”

Iranian Foreign Minister Abbas Araghchi posted on X that ships would use routes designated by the Islamic Republic in coordination with Iranian authorities, suggesting Iran planned to retain some level of control over the channel. It was not clear if vessels would have to pay tolls.

Iranian officials said the blockade was a violation of last week’s ceasefire agreement between Iran and the U.S. The strait “will not remain open” if the blockade continues, Iran’s parliamentary speaker, Mohammad Bagher Qalibaf, posted on X early Saturday.

A data firm, Kpler, said movement through the strait remained confined to corridors requiring Iran’s approval.

U.S. forces have sent 21 ships back to Iran since the blockade began on Monday, U.S. Central Command said on X.

Trump says new talks could happen soon

Trump imposed the blockade as part of his effort to force Iran to open the strait and accept a Pakistan-brokered ceasefire to end almost seven weeks of war that has raged between Israel, the U.S. and Iran.

The president's decision to continue the blockade despite Iran’s announcement appeared aimed at sustaining pressure on Tehran as the fate of the two-week ceasefire reached last week remained uncertain.

Direct talks between the U.S. and Iran last weekend were inconclusive, as the two nations could not agree about Iran’s nuclear program and other points.

Trump suggested a second round of talks could happen this weekend

“The Iranians want to meet,” he said in a brief telephone interview with the news outlet Axios. “They want to make a deal. I think a meeting will probably take place over the weekend.”

Oil prices fell Friday on hopes the U.S. and Iran were drawing closer to an agreement . The head of the International Energy Agency had warned that the energy crisis could get worse if the strait did not reopen.

Two Iranian semiofficial news agencies seemed to challenge Araghchi's announcement about the strait.

Considered close with Iran's powerful Revolutionary Guard, the Fars news agency issued a series of posts on X criticizing what it said was a lack of clarity over the decision to reopen the waterway and a “strange silence from the Supreme National Security Council and the negotiating team.”

Iran’s Supreme National Security Council has recently acted as the country's de facto top decision-making body, amid doubts over the status of the new supreme leader, Mojtaba Khamenei, who was reportedly wounded early in the war.

The Mehr news agency also said the decision to reopen the strait needed “clarification” and required the supreme leader’s approval.