South Korea has summoned the Iranian ambassador in Seoul after a government investigation concluded that Iranian-developed Noor-series anti-ship missiles were likely used in the May 4 attack on the HMM Namu, a cargo vessel operated by South Korean shipping firm HMM Co. The ship was struck by two missiles while stranded in the Strait of Hormuz (the narrow waterway connecting the Persian Gulf to the Arabian Sea, through which a large share of the world's oil passes) during the ongoing U.S.-Iran conflict; one warhead failed to detonate while the second exploded on impact, causing a fire and leaving one crew member with minor injuries. Seoul's First Vice Foreign Minister Park Yoon-joo said multiple pieces of evidence point toward Iran, though investigators could not confirm the exact launch site, perpetrator, or intent — and Iran continues to deny any involvement.