The International Maritime Organization suspended its evacuation operation in the Strait of Hormuz on Thursday after a cargo ship was struck by a projectile while using a UN-backed corridor designed to help stranded vessels escape the region.

The attack ended what had been a painstakingly negotiated safe passage. The IMO had been coordinating the movement of ships and crews trapped in the strait during rising military tensions in the Persian Gulf. The plan — agreed upon with relevant parties — was supposed to let commercial vessels leave safely. When the cargo ship was hit, the UN shipping agency halted the entire operation temporarily.

No group has claimed responsibility for the strike. The UN has not publicly blamed anyone. As of June 25, the identity of the ship and the damage it sustained have not been officially confirmed.

The Strait of Hormuz is the world's most important chokepoint for maritime shipping. About one-fifth of all global oil trade passes through this 21-nautical-mile-wide channel between Iran and Oman. Any serious disruption here ripples immediately through energy markets and supply chains far beyond the Gulf region. The IMO's evacuation corridor had been rare evidence of cooperation in an otherwise tense operational environment — Reuters reported on June 23 that the plan was actively moving ships before Thursday's strike halted it.

The suspension leaves dozens of commercial vessels and their crews in legal and physical uncertainty. Seafarers stuck in or near the strait face real dangers: exposure to ongoing military activity, contract disputes with employers, and the practical problem of not being able to take on supplies or rotate crews. The IMO's job is to protect international shipping, and this operation had been one of its most exposed interventions in recent years.

The question of intent matters heavily for what happens next. If the attack was deliberate — aimed specifically at the evacuation corridor — it signals that at least one actor is willing to strike even at humanitarian passages, which would make resuming the operation far harder to negotiate. If the strike was accidental, there may be room to renegotiate the corridor's rules with better safety measures. The IMO has given no timeline for reassessment.

The strain on the strait has been mounting for weeks. U.S. military operations against Iran and the resulting security risks have left shipping companies and flag states (the nations that register ships) with limited options. Insurance clubs have already adjusted their war-risk ratings for Gulf transits, and many ship owners had been waiting for the IMO corridor to move their vessels out. That exit is now closed, at least for now.

What comes next will hinge on whether the IMO tries to rework the corridor — perhaps with longer advance notice, different transit times, or more guarantor nations involved — or whether the security situation has shifted enough that restarting the operation will not be realistic in the short term. Shipping operators and cargo owners with interests in the region are watching closely for the IMO's next move.