Iran's central joint military command announced the closure of the Strait of Hormuz to vessel traffic on Saturday, June 20, 2026 [1].
The move threatens one of the world's most vital oil transit chokepoints and signals a rapid deterioration of a recently signed ceasefire agreement between Iran and the United States.
Khatam al‑Anbiya Central Headquarters and the Islamic Revolutionary Guard Corps said the closure is a response to Israeli strikes in southern Lebanon. Iranian officials said these attacks breach the ceasefire and that the United States has also violated the truce [2, 3].
"It is hereby announced that the Strait of Hormuz will be closed to vessel traffic; it is noted that this first step is a response to the enemy's breach of promise," a spokesperson for the Iranian Central Military Command said. The spokesperson said that if aggression continues, further steps will be planned to force the enemy to comply with its obligations [4].
Another Iranian military spokesperson said the closure is a direct response to continued Israeli strikes in Lebanon that violate the ceasefire signed with the U.S. [5].
The United States disputes the status of the waterway. While Tehran announced the shutdown, the U.S. government said the waterway remains open [6].
Reports regarding the nature of the closure are conflicting. The Associated Press reported that Iran fired on ships attempting to pass the Strait after reversing a previous reopening [7]. However, other reports on the announcement did not mention firing on vessels [8].
U.S. Vice‑President JD Vance said he expects to travel to Switzerland soon for talks with Iran [9].
“"It is hereby announced that the Strait of Hormuz will be closed to vessel traffic."”
The closure of the Strait of Hormuz serves as a high-stakes geopolitical lever, as the narrow waterway connects the Persian Gulf with the Gulf of Oman. By linking the transit of global energy supplies to the conduct of Israeli forces in Lebanon, Iran is attempting to internationalize the pressure on the ceasefire. The discrepancy between Iranian claims and U.S. reports regarding whether ships are actually being blocked suggests a period of tactical ambiguity and potential escalation.
