Iran IRGC
The Islamic Revolutionary Guard Corps (IRGC) is the primary instrument through which Iran enforced its closure of the Strait of Hormuz beginning 28 February 2026. Within hours of Operation Epic Fury, the IRGC transmitted VHF radio warnings to all vessels forbidding passage. A senior IRGC official formally declared the strait closed on 2 March, threatening to set ships “ablaze” if they attempted transit. By 4 March, the IRGC claimed “complete control” of the strait. The IRGC executed 21 confirmed attacks on merchant ships between March 1 and April 18, 2026, killing at least 7 crew members and injuring others. Notable attacks include the MT Skylight (2 Indian crew killed, March 1), the MV Mayuree Naree (3 crew killed, March 11), and the Mussafah 2 tugboat (4 crew killed, March 6).
Iran IRGC [causes] 2026 Strait of Hormuz Crisis Iran IRGC [opposes] US Naval Blockade Operation Epic Fury [causes] Iran IRGC
The IRGC employed four distinct methods to restrict traffic: (1) kinetic attacks using drones, missiles, and fast attack boats; (2) naval mines laid erratically by small boats, including in ways that made tracking difficult; (3) GPS/satellite spoofing and GNSS jamming that disrupted navigation; and (4) war-risk insurance escalation through the cumulative threat effect — all four methods together made the economic risk of transit prohibitive for most shipowners. On 10 March, the US military reported that Iran had begun planting naval mines, and destroyed 16 Iranian minelayers in response. By April, Iran had reportedly lost track of some of the mines it laid — US officials said Iran placed them “erratically” and did not systematically record positions — which became a key obstacle preventing Iran from reopening the strait even when it wanted to.
Iran IRGC [causes] Naval Mines Crisis Naval Mines Crisis [contradicts] Iran IRGC Iran IRGC [relates] Islamabad Talks
The IRGC operated a selective passage system — a de facto toll booth — allowing ships from China, Russia, India, Iraq, Pakistan, Malaysia, Thailand, and the Philippines to transit upon payment and coordination with Iranian maritime authorities. Payments were reportedly assessed in Chinese yuan. One ship paid $2 million to use Iran’s designated channel north of Larak Island. This selective access system was framed by analysts as “Iran Is Not Blocking the Strait — It’s Running a Toll Booth.” The IRGC Navy commander Alireza Tangsiri was killed in an Israeli airstrike on March 26, 2026, with Israel’s defense minister attributing direct responsibility for the closure to him.
Iran IRGC [causes] Toll Booth System Alireza Tangsiri [part-of] Iran IRGC Iran IRGC [relates] China
On April 18, following Iran’s reversal of its brief reopening of the strait, IRGC gunboats fired on the Indian-flagged VLCC Sanmar Herald (despite prior clearance having been granted) and the Jag Arnav, forcing both to turn back. A container ship (later identified as the French CMA CGM Everglade) was struck by a rocket off Oman. These attacks, coming after Iran had declared the strait “completely open” the previous day, escalated the standoff sharply and triggered an Indian diplomatic protest. India summoned Iran’s ambassador and called the incident a “serious incident.” On April 19, the IRGC declared its closure of the strait “impossible to reverse” while the US blockade remained, signaling a hardened negotiating position.
Iran IRGC [causes] India-Iran Diplomatic Incident Iran IRGC [opposes] Strait of Hormuz Sanmar Herald [part-of] Iran IRGC
Connections
- Strait of Hormuz — enforcement theater
- 2026 Strait of Hormuz Crisis — parent context
- Operation Epic Fury — triggering event for closure
- Naval Mines Crisis — key tactical tool
- Alireza Tangsiri — IRGC Navy commander (killed Mar 26)
- Toll Booth System — selective passage mechanism
- US Naval Blockade — opposing force
- India-Iran Diplomatic Incident — April 18 incident