Cargo Ship in Persian Gulf Hit by ‘Unknown Projectile’ as US–Iran Tensions Simmer

A UK maritime monitoring agency added that a large explosion was reported.
Published: 6/1/2026, 4:59:08 PM EDT
Cargo Ship in Persian Gulf Hit by ‘Unknown Projectile’ as US–Iran Tensions Simmer
Tankers anchored in the Strait of Hormuz off the coast of Qeshm Island, Iran, on April 18, 2026. (Asghar Besharati/AP Photo)

A cargo ship that was transiting the Persian Gulf was struck by an "unknown projectile" that caused a large explosion, according to an organization run by the UK's Royal Navy on June 1. The report came hours after the U.S. military said it struck targets inside Iran.

The UK Maritime Trade Organization (UKMTO) said in an X post on June 1 that it received a report of an incident about 40 nautical miles south of Umm Qasr, Iraq, in the Persian Gulf, sometimes called the Arabian Gulf.

"A cargo vessel was transiting in the Arabian Gulf when a large explosion follow[ed] a hit from an unknown projectile on the starboard side," the UKMTO wrote.

It stated that it was "unaware of any environmental impact" and that an investigation was underway.

Ships in the region are being advised by the UK group "to transit with caution and report any suspicious activity to UKMTO." It provided no other details, including the ship's name or whether any injuries were reported.

Since the start of the conflict between the United States and Iran on Feb. 28, Tehran has effectively shut down commercial traffic in the Strait of Hormuz, a waterway that links the Persian Gulf with the wider ocean and allows passage of roughly a fifth of the world's traded oil and natural gas on a normal day.

Iran has launched strikes against and has threatened commercial ships in the strait as well as elsewhere in the region, and it has asserted that it should have control over the strait and impose tolls.

A ceasefire was announced in mid-April, while the U.S. military has blockaded Iranian ports. But the truce between the two nations has been tested repeatedly in back-and-forth strikes even as both countries have indicated they want to negotiate a deal.

The latest incident comes as the U.S. military command said it launched strikes against Iranian radar and drone sites after Tehran said it shot down a U.S. military drone over the weekend.

Iran's Islamic Revolutionary Guard Corps said on June 1 that it had "destroyed all predetermined targets" at an air base used by the U.S. military in response to a U.S. attack on southern Iran, according to state-run IRNA. U.S. military officials said on June 1 that two ballistic missiles fired by Iran at the base in Kuwait were intercepted.

Iranian state-run media said on June 1 that Tehran has officially halted talks with Washington in response to Israeli strikes against the Lebanese Hezbollah, saying that it will not submit messages to the United States through a mediator. Iranian officials also want an immediate halt to Israeli military operations in Gaza and Lebanon, state-run media said.

Israeli Prime Minister Benjamin Netanyahu announced on June 1 that he had ordered the Israel Defense Forces to strike Hezbollah targets in Beirut, an escalation in fighting against the terrorist organization.

Amid the recent military activity, U.S. President Donald Trump said early on June 1 that he believes Iran "really wants to make a deal" with the United States and criticized people who have been suggesting that he move more quickly or more slowly in the negotiations.