The United States Navy seized an Iranian-flagged cargo ship in the Strait of Hormuz on or around April 19–20, 2026, in an operation President Trump publicly confirmed. The vessel was struck and boarded, with U.S. forces taking control of the ship in one of the world's most strategically vital waterways. Iran condemned the action and issued threats of retaliation, while access through the strait was reported to have been disrupted, trapping thousands of sailors aboard vessels in the area.

President Trump announced the seizure, describing the Navy as having "blown a hole" in the Iranian ship before boarding it. The operation marks a significant escalation in U.S.-Iran tensions at a time when nuclear talks between the two countries remain uncertain. Tehran swiftly threatened a response, raising fears of a broader confrontation in a region already under considerable strain.

Iran's actions in the strait triggered immediate consequences in global markets. Oil prices rose sharply and equities fell on news of the disruption to one of the world's most critical shipping corridors, through which roughly a fifth of global oil supply passes. The FTSE 100 and other major indices registered declines as traders assessed the risk of prolonged instability.

Inside Iran, the episode coincided with reports of intensifying domestic protests, with citizens demanding an end to the current government. The confluence of external military pressure and internal unrest has amplified uncertainty around the Iranian government's next moves, both diplomatically and militarily.

Distress calls were reported from vessels caught in the strait amid the disruption, and emergency maritime communications documented a tanker fire in the area. The U.S. government has not yet provided a full legal or operational accounting of the seizure, though officials framed it in the context of ongoing pressure on Iran over its nuclear program and regional conduct.