A commercial ship with ties to Israel is alleged to have been seized by Iran early on Saturday morning as it crossed the Strait of Hormuz.
According to an MSC statement, Iranian special forces boarded the MSC Aries around 50 miles (80 km) off the coast of the United Arab Emirates.
Video that the Reuters news agency was able to collect seems to show soldiers jumping from a chopper onto the ship.
The Portuguese-flagged ship is linked to Israeli billionaire Eyal Ofer.
The incident comes amid heightened expectation of an Iranian attack on Israel after an airstrike destroyed Iran's consulate in Damascus at the start of April. Israel said on Saturday Iran would bear the consequences for choosing to escalate the situation any further.
Tracking data last showed the MSC Aries off the coast of the UAE, heading towards the Strait of Hormuz over 18 hours ago. It then appeared to turn off its tracking data, which is common for Israeli-affiliated ships in the region.
The UK's Maritime Trade Operations agency confirmed the boarding in a statement. It made no mention of Iranian involvement, instead stating that the ship had been seized by "regional authorities" off the coast of Fujairah in the UAE.
However, Iranian media has been quick to trumpet the involvement of the country's special forces in the attack.
The country's state news agency, Irna, said the naval branch of the Islamic Revolution Guards Corps (IRGC) had seized the MSC Aries as it was "linked to Israel". It added that the ship was in the process of being transported to Iranian waters.
In video footage, troops could be seen rappelling onto the vessel from a helicopter hovering overhead. A crew member could be heard shouting: "Don't come out."
In the video, one commando could also be seen kneeling to provide cover fire as other troops boarded the ship. According to MSC there were 25 crew members onboard at the time of the seizure.
Officials in Tehran have yet to comment on the seizure.
The ship is managed by MSC, which leases the vessel from Gortal Shipping Inc - a company affiliated with Mr Ofer's Zodiac Maritime.
In response to the attack, Israeli Foreign Minister Israel Katz called on the European Union "to immediately declare the Iranian Revolutionary Guards corps as a terrorist organization and to sanction Iran" in a post on X, formerly known as Twitter, saying that the cargo ship belongs to an EU member.