Hormuz blockade 2026: US targets Iranian port traffic

Blockade begins after Trump order

The United States said it will enforce a maritime blockade on Iranian ports from April 13, escalating the ongoing confrontation in and around the Strait of Hormuz. The move follows directives issued by President Donald Trump, after recent US-Iran talks in Pakistan ended without an agreement. Updates said the US military would begin implementing the blockade around 7:30 pm (IST) shortly after Trump’s order. A separate update said the blockade took effect at 1400 GMT and applies to all ships leaving or seeking to dock at Iranian harbours. The US framed the action as targeting Iranian-linked maritime activity while keeping navigation open for vessels not associated with Iranian ports.

What CENTCOM said about enforcement

United States Central Command (CENTCOM) said the blockade will apply uniformly to vessels of all nationalities operating in and around Iranian ports and coastal regions. The restrictions are aimed at controlling maritime activity linked to Iran, according to the command. At the same time, the US military said it will “not impede freedom” of navigation for vessels transiting the Strait of Hormuz to and from non-Iranian ports. CENTCOM said additional operational details would be shared with commercial shipping operators. Mariners were advised to stay updated through official broadcasts and maintain communication with US naval forces while navigating the region.

Diplomacy broke down in Pakistan

The decision came after diplomatic efforts between Washington and Tehran in Pakistan collapsed. The talks in Islamabad were described as the highest-level meeting between the two sides since the 1979 Islamic revolution, with nuclear weapons and Hormuz among the key points of contention. The article also referenced a prior two-week cessation of hostilities agreed on April 9, under which both sides were to pause offensive operations, with the US suspending planned airstrikes and Iran agreeing to keep the Strait of Hormuz open and ensure safe passage for oil ships. Subsequent reporting said ceasefire talks in Pakistan failed, leading Trump to order the blockade.

Trump and JD Vance harden messaging

Trump publicly reinforced the blockade decision on social media. In one post, he said: “Effective immediately, the United States Navy, the Finest in the World, will begin the process of BLOCKADING any and all Ships trying to enter, or leave, the Strait of Hormuz.” He also warned: “Any Iranian who fires at us, or at peaceful vessels, will be BLOWN TO HELL!” Another update quoted Trump as saying most of Iran’s navy had already been destroyed during the war and that if Iran’s remaining “fast attack ships” approached the blockade they would be “immediately ELIMINATED”.

US Vice-President JD Vance, in a separate update, accused Iran of engaging in “economic terrorism” by blocking traffic through the Strait of Hormuz, warning of a reciprocal US response. The live updates headline also carried a warning attributed to Vance: “No Iranian ships getting out.”

Iran’s response: warnings and legal claims

Iran’s Islamic Revolutionary Guard Corps (IRGC) warned that any escalation would be met with force in the strategic waterway. It said “any miscalculated move will trap the enemy in the deadly whirlpools in the Strait,” and Tehran also claimed its forces had the Strait of Hormuz “under full control.” Iranian officials described US restrictions in international waters as illegal. An Iranian Armed Forces spokesperson said the US restrictions “amounts to piracy,” and said Iran would decisively implement a “permanent mechanism” to control the Strait following US threats.

Other Iranian statements highlighted the risk of wider regional spillover. A report said Iran responded by threatening all ports in the Persian Gulf and the Gulf of Oman. Iranian parliament speaker Mohammad Bagher Qalibaf said, “If you fight, we will fight.” Separately, Iran’s Foreign Minister Seyed Abbas Araghchi claimed a phone call from Israeli Prime Minister Benjamin Netanyahu to Vance during negotiations derailed a potential breakthrough, an allegation Washington had not confirmed or denied.

Shipping moves: tankers steer clear, mixed signals on transit

Ahead of enforcement, shipping data cited in the updates showed oil tankers steering clear of the Strait of Hormuz. The US military also said two US warships transited the strait at the start of a mine clearance operation, while Iran denied the claim and said it prevented the warships from crossing. Another update reported that Pakistan merchant ships were initially denied permission by Iranian authorities but were later allowed to cross the strait into the Persian Gulf.

Oil crosses $100 and markets react

The developments quickly fed into energy market volatility. Oil prices climbed above $100 a barrel and were reported up over 7% as the US Navy prepared to block ships to and from Iran via the Strait of Hormuz. The reporting linked the price move to the risk of restricting Iranian oil exports and the broader threat to shipping in a key global energy chokepoint. Another update said oil prices resumed their climb and Asian markets mostly declined as the US prepared to blockade shipping connected to the strait.

Key facts at a glance

Why this matters for trade and energy supply chains

The Strait of Hormuz is a strategic waterway for global trade routes and oil supply chains, and the reporting explicitly flagged concerns about potential disruption. The US position, as described, attempts to narrow the operational target to Iranian port-linked traffic while keeping non-Iran transit moving. Iran’s statements, including threats to ports in the Persian Gulf and the Gulf of Oman, indicate a wider risk perimeter than Iranian ports alone. With oil already moving above $100 and up more than 7% in the cited update, investors and businesses tied to fuel costs are likely to keep close watch on any further operational guidance from CENTCOM and on-the-water incident reporting.

What to watch next

CENTCOM said it will share additional operational details with commercial shipping operators, making official advisories and broadcasts a key near-term signal for how the blockade functions in practice. The situation also remains linked to diplomacy, given the earlier ceasefire framework described on April 9 and the subsequent failure of talks in Pakistan. Further updates from the US, Iran, and regional stakeholders will shape whether the blockade remains limited to Iranian port-linked traffic or becomes harder to separate from broader Strait activity.