Iran re-closes Strait of Hormuz and fires on Indian oil tankers

Iran announced on April 18, 2026 that it was re-closing the Strait of Hormuz to vessels heading to or from U.S., Israeli, and allied ports, citing U.S. port blockade violations. IRGC gunboats fired on two Indian-flagged tankers — SANMAR HERALD and a second vessel — attempting transit, injuring crew members and prompting India to summon Iran's ambassador. Tanker traffic dropped by roughly 70% within 36 hours, stranding over 150 ships outside the strait. The International Maritime Organization reported approximately 20,000 mariners and 2,000 ships trapped in the Persian Gulf.