Iran re‑closes Strait of Hormuz, citing US blockade

Iran closed the Strait of Hormuz on April 18, said it will stay shut until the U.S. lifts its blockade, and IRGC forces fired on a tanker.^[1] The closure follows a brief reopening that lasted only a few hours.^[3]

The narrow waterway between Iran and Oman carries roughly a fifth of the world’s petroleum, so any interruption ripples through global markets. Iran’s foreign ministry spokesperson said, "We will continue to block the strait until the United States lifts its illegal blockade."[quote1] The IRGC commander said, "Our forces fired on the vessel that attempted to breach the closure, as per our orders."[quote2] No casualties were reported from the incident.^[4] The U.S. State Department said the move "unacceptable" and said it threatens global commerce.[quote3]

Reports differ on whether the firing occurred. The Guardian said that IRGC “reportedly fired on a tanker as it tried to pass,” while the Review Journal said only the closure without any shooting. Given the IRGC commander’s direct statement, the firing claim is treated as credible. One tanker was hit, according to the Daily Mail.^[2] Iran’s decision comes after a series of U.S. sanctions that Tehran describes as an illegal blockade of its ports.

Regional actors have voiced concern. Oman, which shares the strait’s southern coast, urged all parties to de‑escalate and keep the passage open for commercial vessels. European navies have increased patrols to safeguard merchant shipping, and the United Nations said it called for an immediate dialogue to resolve the dispute.

**What this means** The renewed closure underscores the volatile link between geopolitical tensions and energy security. If the strait remains shut, oil prices could climb, pressuring economies already strained by high energy costs. Continued Iranian pressure may force diplomatic negotiations, but the risk of accidental escalation remains high as military forces operate in close proximity.