Iran's Revolutionary Guard Corps Navy reimposed complete restrictions on the Strait of Hormuz on Saturday, reversing the brief reopening that had raised hopes of de-escalation just 24 hours earlier. The IRGC issued warnings to all vessels at anchor in the Persian Gulf and Sea of Oman that "approaching the Strait of Hormuz will be considered as cooperation with the enemy." This is not rhetorical — Iranian gunboats opened fire on at least one tanker attempting transit, according to UK Maritime Trade Operations. The tanker and crew were reported safe, but the message was unambiguous.
Two Indian-flagged vessels carrying crude oil came under fire from IRGC forces and were forced to abort their transit. Video footage shows Iranian military personnel ordering an Indian ship to turn back. India's Ministry of External Affairs confirmed the incident and summoned Iran's ambassador, Mohammad Fathali, to convey "deep concern." The ministry described this as the ambassador being "called in" — diplomatic language that signals serious displeasure without the full escalation of a formal summons. Eight India-bound ships have now reversed course after attempting to cross the strait.
The trigger for Iran's reversal was the US naval blockade of Iranian ports, which Iran says violates the terms of the ceasefire agreed on April 8th. US Central Command confirmed that more than 12 warships backed by over 10,000 personnel are enforcing the blockade, and 23 ships linked to Iran have been turned back. The US position is that Iran cannot "blackmail" America over Hormuz; Iran's position is that if Iranian ships cannot pass, nobody passes.