A commercial vessel transiting the Strait of Hormuz was struck by an unknown projectile on September 12 at approximately 23:00 UTC, according to UKMTO Warning 134-26 published September 13 [1]. The incident occurred within the strategic waterway connecting the Persian Gulf and Gulf of Oman. As of the warning, crew condition, structural damage, and environmental impact remained unconfirmed; the weapon type and responsible party were not identified, and no claim of responsibility had been made [1].

The attack comes against a backdrop of severely constrained strait traffic. Region Alert's September 12 assessment records seven commercial vessels transiting on September 10 — a 94% collapse from the pre-conflict baseline of 125/day [2]. US Naval Forces Central Command has narrowed protected convoy passages to two restricted daily time slots, down from broad overnight coverage [2]. VLCC war-risk charter rates have surged to Worldscale 450, adding an estimated $11.50 per barrel in freight premiums [2].

The Saudi East-West pipeline (Petroline), which bypassed Hormuz for 5M bpd, remains shut after drone strikes hit pumping stations near Riyadh and Medina on September 11 [2]. Combined with Houthi control of Mayyun Island and the Bab el-Mandeb coastline seized September 11, Arabian Peninsula producers lack a functional maritime escape route [2]. Oman and Iran are scheduled to meet in Salalah September 14 to discuss temporary vessel management protocols, though Tehran has insisted this is not an immediate reopening [2].

War-risk insurance for VLCCs prices at roughly 40x pre-crisis levels with six P&I clubs withdrawn, maintaining an insurance-based effective closure. The incident on September 12 did not change this assessment — oil passage through Hormuz remains unconfirmed and heavily constrained.