Iran Guards Declare Strait of Hormuz Shut Until Further Notice

On Sunday, July 12, 2026, the navy of Iran's Islamic Revolutionary Guard Corps (IRGC) announced that the Strait of Hormuz is closed "until further notice".

The IRGC indicated that no vessels will be allowed to transit this vital international waterway until the United States ceases what Tehran refers to as its regional interventions. This announcement has effectively dismantled a fragile interim ceasefire agreement established the previous month, significantly heightening tensions throughout the Middle East.

The closure follows an IRGC assault on a Cyprus-flagged container ship navigating the strait. Iranian state media reported that the military launched warning cruise missiles after the vessel disregarded instructions and traveled along an "unapproved" route.

The United Kingdom Maritime Trade Operations (UKMTO) confirmed that the targeted commercial vessel sustained considerable damage to its engine room, resulting in a fire that compelled the crew to evacuate into lifeboats. One civilian crew member is still unaccounted for.

In response, U.S. Central Command (CENTCOM) executed its third significant wave of airstrikes this week, targeting approximately 140 Iranian military installations, including drone hangars, missile sites, coastal surveillance facilities, and naval assets.

U.S. President Donald Trump and military officials publicly challenged Iran's closure announcement, asserting that freedom of navigation is being upheld. CENTCOM responded by stating that "Iran does not control the strait" and that maritime traffic continues to operate via an expanded southern route near Oman.

Following the American airstrikes, the IRGC initiated retaliatory missile and drone strikes against U.S. military bases and allied infrastructure throughout the Gulf, targeting locations in Oman, Qatar, Kuwait, Jordan, and the UAE. The Strait of Hormuz is recognized as the world's most crucial maritime chokepoint, typically facilitating approximately 20 percent of global oil and liquefied natural gas (LNG) shipments. 

The reimposed closure poses a risk to global energy markets and causes an increase in crude oil prices.

At the same time, the U.S. Treasury Department has rescinded a temporary sanctions waiver that had permitted Iran to sell crude oil under the initial agreement from the previous month.

Regional mediators from Qatar and Oman are currently engaged in urgent discussions with Iranian officials to preserve diplomatic avenues, although Iranian military leaders have cautioned that their "fingers are on the trigger" for a more intense reaction should additional strikes take place.