South Korea has concluded that two unidentified airborne objects struck a South Korean-operated cargo vessel in the Strait of Hormuz on 4 May, causing an explosion and fire that left a significant breach in the ship's hull. The foreign ministry announced the findings on 10 May following an on-site investigation, saying the objects struck the stern of the HMM Namu approximately one minute apart, beginning at 3:30 p.m. local time. The strike created a 5-by-7-metre rupture in the hull, damaging plating all the way to the vessel's interior. No injuries or casualties were reported among the 24 crew members on board, including six South Korean nationals.

The HMM Namu is a Panama-flagged cargo vessel operated by South Korean shipping firm HMM Co. It had been among roughly 2,000 vessels stranded in the Strait of Hormuz — the narrow waterway between the Persian Gulf and the Gulf of Oman that serves as one of the world's most critical shipping lanes — amid the ongoing U.S.-Israeli military campaign against Iran that began in late February. The vessel was subsequently towed to a port in Dubai, where a seven-member South Korean government team conducted its investigation. CCTV footage captured the objects, but officials acknowledged limitations in determining their exact type, size, or origin. Authorities said the possibility of mines or torpedoes appeared low, while analysts noted the damage pattern was consistent with either suicide drones — a weapon associated with Iranian forces — or an anti-ship missile.

Iran has categorically denied any involvement. Shortly after Seoul published its findings, the Iranian ambassador to South Korea, Saeed Koozechi, visited the foreign ministry in Seoul to receive a briefing on the investigation's conclusions. U.S. President Donald Trump had earlier claimed Iran had "taken some shots" at the vessel, and used the incident to press Seoul to join U.S.-led efforts to protect freedom of navigation in the strait, specifically the proposed Maritime Freedom Construct (MFC), a framework combining intelligence sharing with diplomatic and military coordination.

The confirmed attack is now reshaping South Korea's calculus on regional security commitments. Seoul has historically maintained a cautious stance on deploying military assets to the Gulf, and any expanded role would require approval from the National Assembly. Officials indicated that an initial contribution might take non-combat forms, such as intelligence sharing or the dispatch of liaison officers. If a military deployment were ordered, observers say Seoul's most likely option would be to redirect the Cheonghae Unit, currently conducting anti-piracy operations in the Gulf of Aden off the Somali coast. The defense ministry said it will provide "necessary support" for the ongoing investigation and is weighing its position carefully, taking into account South Korean law, the U.S.-South Korea alliance, and security conditions on the Korean Peninsula. Further forensic analysis of engine debris recovered from the scene is expected to shed light on the exact nature of the weapons used and, potentially, their origin.