Iran Threatens to Close Strait of Hormuz Over US Blockade

Iran has threatened to close the Strait of Hormuz again if the United States maintains its naval blockade on Iranian ships and ports, despite having fully reopened the waterway to commercial vessels earlier in the week.

The warning came from Iranian officials on Saturday, April 18, 2026, as a fragile ceasefire between the U.S. And Iran showed signs of strain. Tehran stated that the Strait of Hormuz “will not remain open” if the American blockade continues, according to reports from multiple international news outlets.

Earlier in the week, Iran announced it had fully reopened the Strait of Hormuz to commercial traffic, reversing earlier disruptions caused by regional hostilities. However, the U.S. Government, under President Donald Trump, insisted the blockade on Iranian ships and ports would remain “in full force” until Tehran reaches a deal with the United States, including on its nuclear program.

The Strait of Hormuz, a narrow and strategically vital waterway between Oman and Iran, has been a focal point of global attention since the outbreak of the broader Middle East conflict involving the U.S., Israel, and Iran. It serves as a critical chokepoint for global oil shipments, with a significant portion of the world’s seaborne petroleum passing through its waters.

Regional developments have added complexity to the situation. A 10-day truce appeared to be holding in Lebanon early Friday, offering a potential pause in fighting between Israel and the Hezbollah militant group. This development was seen as possibly clearing one major obstacle to a broader diplomatic deal between Iran, the United States, and Israel aimed at ending weeks of devastating war.

On the ground in Tehran, state-organized rallies continued in support of Iran’s leadership, including a gathering on National Girl’s Day where members of the Basij paramilitary, affiliated with the Islamic Revolutionary Guard Corps, participated. Meanwhile, members of Iran’s Jewish community observed memorials for victims of U.S. And Israeli strikes at synagogues in the capital.

In southern Lebanon, residents began returning to their villages following the Israel-Hezbollah ceasefire, while others inspected damage from Israeli airstrikes in areas such as Jibchit. These humanitarian movements underscored the fragile but tangible impact of the temporary de-escalation.

Despite these localized signs of stability, the overarching tension between Iran and the United States remains unresolved. Iranian officials have consistently linked the status of the Strait of Hormuz to the continuation of the U.S. Naval blockade, framing any closure as a direct response to what they describe as an ongoing violation of ceasefire terms.

As of Saturday, no indication emerged that either side was prepared to back down. The United States maintained its position that the blockade would persist until a comprehensive agreement is reached, while Iran warned that the reopening of the Strait was conditional and reversible.

The situation leaves global energy markets and international shipping operators watching closely, aware that any renewed closure of the Strait of Hormuz could trigger significant disruptions to global trade and energy supplies.