The United States will begin a naval blockade of all maritime traffic entering and exiting Iranian ports at 10 a.m. EDT on Monday, April 13, 2026, U.S. Central Command announced.

CENTCOM said the blockade “will be enforced impartially against vessels of all nations entering or departing Iranian ports and coastal areas,” including all Iranian ports on the Arabian Gulf and Gulf of Oman. It added that U.S. forces “will not impede freedom of navigation for vessels transiting the Strait of Hormuz to and from non-Iranian ports”.

The move follows the collapse of U.S.-Iran talks in Pakistan over the weekend, which failed to reach a deal to end six weeks of fighting. President Donald Trump said the U.S. Navy would also “seek and interdict every vessel in International Waters that has paid a toll to Iran” and begin destroying mines placed in the Strait of Hormuz.

CENTCOM said additional information will be provided to commercial mariners through a formal notice before the blockade starts. The blockade is narrower than Trump’s earlier description of blockading “any and all ships trying to enter or leave the Strait of Hormuz,” but broader in targeting all Iranian ports, including those along the Gulf of Oman.

Oil prices jumped in early Monday trading, with Brent crude rising 7.98% to $102.80 a barrel and WTI up 8.61% to $104.88, as markets reacted to the potential disruption of Iranian exports. About 20% of global energy supplies transit the Strait of Hormuz.