The United Nations International Maritime Organization (IMO) has suspended its operation to escort commercial vessels through the Strait of Hormuz.
The decision follows a report that a ship was attacked within the strait on Thursday, effectively halting the mission's efforts to clear hundreds of ships and approximately 11 million barrels of oil from the corridor.
The suspension marks a sharp reversal in the security posture of the world's most critical energy chokepoint.
Just hours earlier, markets had begun to price in a de-escalation, with Brent crude collapsing to pre-war levels as shipping activity appeared to resume.
The reported attack and subsequent UN pause suggest that the preliminary deal to end the Iran war remains fragile, leaving commercial movement through the strait effectively stalled once again.
For traders, the development reintroduces immediate supply-side uncertainty.