The United States has announced that it will begin blocking all maritime traffic entering and exiting Iranian ports from Monday, April 13, marking a significant escalation in tensions in the region. The move, confirmed by the US Central Command, will come into effect at 10 a.m. Eastern Time and apply to vessels of all nations.

According to the US military, the blockade will be implemented “impartially” and will cover all Iranian ports and coastal areas, including those along the Arabian Gulf and the Gulf of Oman.

Blockade To Cover All Iranian Port Activity

In a statement posted on X, CENTCOM said its forces would begin enforcing the blockade in line with a presidential proclamation. The military emphasised that the restrictions would apply universally to all ships using Iranian port infrastructure, regardless of nationality.

https://t.co/YAFhMBm7hA

— U.S. Central Command (@CENTCOM) April 12, 2026

The announcement signals a broad operational scope, targeting maritime access to Iran’s coastal facilities rather than selective enforcement. The US military described the measure as a controlled and monitored operation, with instructions issued to commercial vessels navigating the region.

Mariners have been advised to remain vigilant, monitor official “Notice to Mariners” broadcasts, and maintain communication with US naval forces via bridge-to-bridge channel 16 when operating in surrounding waters.

Strait Of Hormuz Transit To Remain Open

Despite the sweeping nature of the blockade, the US has clarified that it will not interfere with freedom of navigation through the strategically critical Strait of Hormuz, provided vessels are travelling to or from non-Iranian ports.

CENTCOM reiterated that ships passing through the Strait — a vital artery for global energy supplies — would be allowed to transit without obstruction. This assurance appears aimed at preventing disruption to international trade routes and calming concerns among global shipping operators.

The Strait of Hormuz connects the Arabian Gulf with the Gulf of Oman and remains one of the most important chokepoints for global oil transport.

Iran Relaxes Hormuz Restrictions For Select Nations

Amid the US announcement, Iran has reportedly eased restrictions in the Strait of Hormuz for select countries, including India, Russia, China, Pakistan and Iraq. The move suggests a parallel effort by Tehran to maintain strategic and economic ties with key partners despite mounting tensions.

While the US blockade targets Iranian port activity, Iran’s decision to allow smoother passage for certain nations could help sustain trade flows and mitigate the broader economic impact.

The evolving situation underscores the fragile balance in the region, with both sides signalling firmness while attempting to avoid disruption to global shipping lanes.

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