Based on verified claims and recent news reports, here is my analysis:

Reasoning:

• The Strait of Hormuz was initially closed in early March 2026 during the Iran war, then briefly reopened on April 17, 2026 following a 10-day ceasefire between Israel and Lebanon¹²³.
• On April 18, 2026, Iran's Islamic Revolutionary Guard Corps (IRGC) Navy announced a dramatic reversal, stating the strait would be closed again until the United States lifts its naval blockade on Iranian vessels and ports²³.
• The IRGC issued a direct warning that "no vessel of any kind should move from its anchorage in the Persian Gulf and the Sea of Oman, and approaching the Strait of Hormuz will be considered cooperation with the enemy, and the offending vessel will be targeted"³.
• More than a dozen commercial ships passed through the waterway during the brief reopening before Iran reimposed the blockade³.
• Reports confirm the IRGC fired on commercial ships attempting to transit the strait on April 18, 2026, validating that the blockade is actively being enforced³².

Overall validity: 95%

1. Iran threatens to again close Strait of Hormuz, if U.S. blockade continues - The Hindu
2. More than 3,400 Iranians killed in war - as it happened - The Guardian
3. Iran reasserts control of Hormuz Strait as Trump warns ... - Al Jazeera