The authority set up by Iran to manage the Strait of Hormuz has warned ships of consequences if they use "illegal routes" in the region.
"This risks financial and life losses for the vessel, owner, master and crew, and seriously restricts its future Strait of Hormuz passage," the Persian Gulf Strait Authority (PGSA) said early Sunday on X.
The authority said shipowners must exercise due diligence to prevent such violations. If charterers breach the rules, all vessels belonging to the companies involved could face restrictions in future.
Efforts have been under way for some time to fully reopen the Strait of Hormuz, which remains effectively blocked.
Iran earlier this week submitted a "seven-day plan" to the United States via Qatar, according to Iranian Foreign Minister Abbas Araghchi.
Under the proposal, Washington would have to meet certain conditions before the strait was reopened. The Wall Street Journal reported that the demands included lifting the US naval blockade.
US President Donald Trump rejected the Iranian proposal, telling reporters at the White House that the offer was unacceptable.
Before the war against Iran launched by the US and Israel in late February, shipping through the strait was largely uninterrupted.
Around a fifth of global oil demand passed through the Strait of Hormuz, which is also a crucial route for liquefied natural gas and fertilizer.
Since the war began, Iranian threats and attacks have brought shipping through the strait close to a standstill, sending global oil and gas prices sharply higher.
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