Iranian authorities re‑imposed strict restrictions on the Strait of Hormuz and ordered its closure after U.S. threats, with IRGC gunboats firing on two tankers transiting the waterway.
Iranian authorities announced on Saturday, April 18, 2026, that they have re‑imposed restrictions on the Strait of Hormuz after the United States indicated it would maintain its blockade of Iranian ports. The Islamic Revolutionary Guard Corps (IRGC) navy reported that IRGC gunboats fired on an Indian‑flagged crude‑oil tanker and on another tanker 20 nautical miles northeast of Oman as they attempted to transit the strait. Both vessels and crews were reported safe, and investigations are underway. Iran’s Khatam al‑Anbiya joint military command said the strait is now under “strict management and control by the armed forces” and will remain closed unless the U.S. guarantees full freedom of navigation for vessels to and from Iran. Deputy Foreign Minister Saeed Khatibzadeh reiterated the stance, citing U.S. threats as the cause. The reversal follows a brief reopening after a 10‑day ceasefire agreed between Israel and Lebanon, which had allowed limited tanker traffic. The U.S. President Donald Trump affirmed the blockade will stay in force until a permanent peace deal is reached.