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Published : 16 Jul 2026, 09:09 AM
Shipping companies are avoiding using a US military-guided transit scheme through the Strait of Hormuz after a wave of Iranian attacks on vessels sparked safety concerns, seven maritime security and shipping industry sources said.
For decades ships sailed into and out of the Gulf using a safe set of lanes down the middle of the strait established by the UN’s shipping agency in 1968 dubbed the Traffic Separation Scheme.
Since the Iran war began on Feb 28, Iranian forces have mined this area, forcing vessels to use one of two makeshift routes close to either the Iranian or Omani coast.
Helping Gulf Energy Exports Keep Flowing
In June, Reuters reported that the US military had helped vessels through as part of an operation involving scores of secretive ship-to-ship oil transfers to keep Gulf energy exports flowing, using aerial and water drones as well as helicopters to guide tankers.
The US-assisted initiative enabled the export of tens of millions of barrels of oil, helping dampen the impact on energy prices of the largest-ever disruption in oil and gas supplies.
Yet shippers are evaluating the route on the Omani side of the strait as increasingly dangerous after a wave of attacks on ships.
Iran's Revolutionary Guards on Tuesday claimed responsibility for attacks on two Emirati oil supertankers.
Some five ships have been attacked since Jul 7 – three crude supertankers, one LNG tanker and one container ship – in Omani waters that fell under the US scheme, according to analysis of incidents based on data from the UN's shipping agency.
It was unclear if all the ships were sailing under the US scheme, the sources said.
"The US doesn't seem to have any control over the situation," one shipping source said, adding that their company had opted not to sail through the strait due to crew safety concerns and the deteriorating security situation.
"Iran’s continued ability to target ships sailing through the Omani route means the Trump administration’s proposed solution to keep ships moving is unlikely to work," said Torbjorn Solvedt, principal West Asia analyst with risk intelligence company Verisk Maplecroft.
White House spokeswoman Olivia Wales said the Strait of Hormuz remains open despite recent attacks on commercial shipping.
"The Strait of Hormuz is open, and oil is flowing. Iran is committing acts of international terrorism by shooting at peaceful commercial vessels, targeting and murdering innocent civilians, and the United States is responding forcefully," Wales said.
Escalation as US Reimposes Blockade
A US defense official, speaking on the condition of anonymity, said in the past seven days more than 100 vessels had directly coordinated with the US military to pass through the strait and over 300 had passed through the region more generally, evidence that the US-led efforts were working, even if volumes remain below pre-war levels.
Iran threatened on Wednesday to shut off more regional energy exports, after the US re-imposed a naval blockade of Iranian ports and both sides launched more strikes as they vie for control of the strait.
Tehran is signaling it may use its Houthi allies in Yemen to shut the Bab el-Mandeb, which leads into the Red Sea, opening a new front against Washington and putting two of the world's most vital shipping arteries at risk.
Around nine Greek-operated LNG tankers, which had sailed into the Gulf via Hormuz in the past week to load cargoes, were stuck inside the strait due to the security concerns, another shipping source said.
Two further tankers have been attacked since Jul 7 in open waters outside the strait.
Strait Is Open, Trump Says
US President Donald Trump said in a Truth Social post on Tuesday that the Strait of Hormuz "is open to ALL Ship traffic except for Iran".
The US reimposed its blockade on Iran-linked shipping on Tuesday.
Last week the US Navy-led Joint Maritime Information Center raised its grading on the risks to ships in the strait to "severe" from "substantial" and one below its highest level, "critical".
The raised risk rating followed attacks on three tankers.
In a note issued by the US Navy after the US-coordinated scheme was launched last month, companies were advised that efforts would be made to advise ship crews "but may not be able to communicate threats to vessels in real-time".
The US military had not provided enough clarity on the risks faced by ships sailing through the Omani route, five of the sources said.
"They have stated that the Strait of Hormuz is 'not closed' and remains available to use," a maritime security source said. "This is making operators nervous and uncertain. Whilst they all have to make their own risk assessments, this is clearly not safe, so why say it is open?"
Greek maritime security company Diaplous said in an advisory on Tuesday that the threat environment remains high and advised shipping companies to pause voyages until Saturday.
MARISKS, another Greek maritime security company, in a separate advisory, also said on Tuesday: "At this stage, there is no assurance that transits through the Strait of Hormuz can be conducted with an acceptable level of safety."
