Reuters: Two Limpet Mines Disable Tanker in Hormuz Amid Security Concerns

Key Facts

Reuters reported that a small boat attached two mines to the hull of an oil tanker in the Strait of Hormuz on 29 October, sparking a fire in the engine room and temporarily disabling the vessel. It was not immediately clear who was behind the attack, the news agency said, citing security sources. The incident highlights the risk to ships transiting the strait: the boat was able to approach, place the explosives and withdraw. Reuters did not attribute the operation to any party. The incident also does not substantiate claims that Iranian militants planted limpet mines on ships; those details could not be independently verified.

The UK Maritime Trade Operations (UKMTO), according to Reuters, said the tanker’s crew was safe and the fire had been extinguished. No environmental impact was reported, and the vessel continued its journey to its next port of destination. This information sets clear limits on the reported toll: damage to the engine room and a temporary disruption, with no crew injuries or environmental impact, according to the agency. The safety of seafarers is particularly important in an incident aboard a tanker transiting a busy shipping lane. Available information does not include a financial estimate of the damage or the duration of the disruption.

Reuters quoted the Marisks group as saying that a small boat’s ability to approach a passing tanker, place explosives and withdraw was "a major security concern." The group linked that concern in particular to the strait’s busy shipping lanes. The assessment describes the difficulty of protecting ships from an attack involving a small boat approaching their hull, but does not identify the party responsible for the incident. Available sources also provided no measure of the incident’s impact on maritime traffic or insurance costs. The warning here concerns security risks to transiting ships, not a confirmed change in shipping or insurance prices.

In a broader context, The Wall Street Journal published a report on 3 November saying Iran had used methods in previous weeks that included sending crews to attach limpet mines to ships. The report, according to the available description, was based on regional officials, security companies and analysts. This remains prior context about methods attributed to Iran and does not establish its responsibility for the attack Reuters reported on 29 October. Limpet mines attached to a ship’s hull also differ from claims of naval mines being laid in shipping lanes; the two should not be treated as the same incident. Available sources did not independently confirm the warning attributed to Bahri on 10 November.

In other maritime developments, the UK Maritime Trade Operations said on 30 October that a vessel had been struck by an unidentified projectile south of Lavan Island and its crew was safe, according to The Associated Press. Available information did not identify the type of projectile or who fired it. Later, a US official said, according to an Associated Press report published on 3 November, that the military had carried out defensive strikes on Iranian targets in the Strait of Hormuz. The official added that the strikes targeted Iranians using surface-to-air missiles. These events remain separate from the two-mine attack on the tanker on 29 October.