Among the ships that passed through the waterway were five vessels that had last loaded cargoes from Iran, including oil products and metals, while three liquefied petroleum gas carriers were bound for destinations including China and India.A Panama-flagged tanker carrying LPG from the United Arab Emirates was headed to Indonesia, while two other tankers loaded with refined products from Bahrain were en route to Mozambique and Thailand, respectively, according to the data.

Shipping activity also included a Liberian-flagged tanker transporting around 500,000 barrels of UAE naphtha to Ulsan in South Korea, and a very large crude carrier hauling roughly 2 million barrels of Saudi oil toward Taiwan. Another vessel carrying about 780,000 barrels of Das crude from the UAE was bound for Sri Lanka.

Additional cargoes moving through the strait included fertiliser shipments from Qatar to the UAE and petroleum coke exports from Saudi Arabia to Italy.

The uptick in vessel movements comes after weeks of disruption linked to heightened geopolitical tensions in the Gulf, which had sharply curtailed tanker traffic through one of the world’s most vital energy transit routes.

Donald Trump said on Sunday that U.S. forces would start blockading maritime traffic to Iranian ports, escalating tensions after negotiations failed to produce an agreement to end the conflict, putting a fragile two-week ceasefire at risk.

US Central Command said the blockade would take effect at 10 a.m. ET (1400 GMT) and would apply to all vessels entering or leaving Iranian ports across the Arabian Gulf and the Gulf of Oman. It added that freedom of navigation through Hormuz to non-Iranian destinations would not be impeded.

Shipping data showed several vessels adjusting routes in response. The Malta-flagged very large crude carrier Agios Fanourios I reversed course after attempting to enter the Gulf and is now anchored near the Gulf of Oman.

Other tankers, including the Pakistan-flagged Shalamar and Khairpur, continued operations, heading toward the United Arab Emirates and Kuwait respectively to load cargo.

The Liberia-flagged VLCC Mombasa B also transited the strait earlier on Sunday and is currently ballasting in the Gulf, according to vessel tracking data.Iran’s Islamic Revolutionary Guard Corps warned that any military vessels approaching the strait would be considered a violation of the ceasefire and would face a “decisive” response.

Despite rising tensions, shipping data showed that three fully laden supertankers passed through the strait on Saturday, appearing to be among the first vessels to exit the Gulf since the ceasefire agreement was reached last week.

The Liberia-flagged Very Large Crude Carrier (VLCC) Serifos and China-flagged VLCCs Cospearl Lake and He Rong Hai transited via a designated passage that bypasses Iran’s Larak Island, according to data from LSEG.

Each vessel has the capacity to carry around 2 million barrels of oil.The Strait of Hormuz, through which about one-fifth of global oil and liquefied natural gas supplies pass, had been effectively blocked by Iran since the outbreak of conflict in late February, contributing to supply disruptions and a sharp rise in oil prices.

Serifos, chartered by Thailand’s state energy firm PTT, is carrying crude loaded from Saudi Arabia and the United Arab Emirates and is expected to arrive at Malaysia’s Malacca port on April 21, according to LSEG and Kpler data. It is among several vessels for which Malaysia had sought clearance from Iran to transit the strait, sources said.

Cospearl Lake, carrying Iraqi crude, is scheduled to reach Zhoushan port in eastern China on May 1, while the discharge destination for He Rong Hai, which is transporting Saudi oil, remains unclear. Both vessels are chartered by Unipec, the trading arm of Chinese energy major Sinopec.

Shipping data also showed that hundreds of tankers remain stranded in the Gulf awaiting passage during the limited ceasefire window, underscoring continued constraints on maritime traffic.At the same time, three empty tankers Mombasa B, Agios Fanourios I and Shalamar were navigating the strait to enter the Gulf and load crude.

One of them signaled plans to load Basrah oil in Iraq for delivery to Vietnam.Industry sources and companies involved did not immediately respond to requests for comment.

The partial resumption of tanker movement highlights the critical role of the Strait of Hormuz in global energy flows and the sensitivity of oil markets to geopolitical developments in the region.

Iran’s Revolutionary Guards said ships should avoid the main navigation zone and instead follow designated entry and exit paths to reduce the risk of collision with naval mines.

“All ships intending to transit the Strait of Hormuz are hereby notified they should take alternative routes for traffic,” the statement said, emphasizing maritime safety concerns.

The announcement follows Tehran’s agreement to temporarily reopen the strategic strait as part of a two-week truce reached with Washington. The ceasefire was agreed late Tuesday, shortly before a deadline set by U.S. President Donald Trump for Iran to comply with demands related to the reopening of the passage.

The Strait of Hormuz is a critical global energy corridor, through which roughly one-fifth of the world’s oil supply typically passes.

Iran had effectively restricted traffic through the route since early March, contributing to a surge in global energy prices and heightening concerns over supply disruptions.

The designation of alternative routes signals continued operational risks in the waterway despite the ceasefire, underlining the fragile security environment and the potential for further disruption to global shipping and energy markets.

The proposal, endorsed by lawmakers on a security panel, includes “financial arrangements and rial toll systems” aimed at asserting Iran’s sovereign role, according to state television.

The plan also provide for cooperation with Oman, which shares control of the waterway’s southern side.Strategic chokepoint under strainThe Strait of Hormuz, a key route for global oil and gas shipments, has been effectively constrained since the onset of the U.S.-Israeli war with Iran.

Tehran has limited passage for vessels it says are linked to adversaries, tightening oversight of maritime traffic.Iran’s Revolutionary Guard Corps has maintained a security presence in the area, with maritime monitors reporting that only a limited number of ships are currently transiting daily, often via routes approved by Iranian authorities.

Iranian officials have argued that transit fees are necessary to ensure the safety of shipping through the strait. The chairman of a parliamentary civil affairs committee, cited by Fars news agency, said vessels should contribute financially to security arrangements in the corridor.

The proposal signals a potential shift toward formalizing Iran’s control over access to the waterway, raising concerns among energy markets already strained by supply disruptions.Limited passage amid diplomatic signalsSome vessels have been allowed to pass in recent days.

Ishaq Dar said Iran had permitted 20 additional ships to transit the strait, a move he described as supporting regional stability.U.S. President Donald Trump said last week that 10 oil tankers were allowed through as a goodwill gesture during ongoing tensions, though details of any linked negotiations remain unclear.

The extent and timing of the proposed toll system’s implementation have not been specified.

Ali Mousavi, Iran’s representative to the United Nations’ maritime agency, made the remarks in an interview published on Friday by China’s Xinhua news agency, prior to U.S. President Donald Trump’s warning that Iranian power infrastructure could be targeted if the strategic waterway was not kept “fully open” within 48 hours.

Mousavi, who also serves as Iran’s ambassador to the United Kingdom, said ships not associated with Iran’s adversaries would be permitted to transit the strait, provided they coordinate security and safety arrangements with Tehran.

He added that Iran would continue working with the International Maritime Organization to ensure maritime safety and the protection of seafarers in the Gulf region.The Strait of Hormuz, a narrow passage between Iran and Oman, handles roughly one-fifth of global oil and liquefied natural gas shipments, making it one of the world’s most critical energy chokepoints.

Concerns over potential Iranian attacks during the ongoing U.S.-Israeli military campaign have already deterred many vessels from using the route, raising the risk of disruptions to global energy supplies.

Mousavi said diplomacy remained Tehran’s priority but emphasized that a “complete cessation of aggression” and the restoration of mutual trust were essential. He attributed the current situation in the strait to what he described as Israeli and U.S. attacks against Iran.

Trump’s earlier warning has heightened fears of further escalation in the region, with shipping security and energy market stability closely tied to developments in the waterway.