Updated

Iran said on Sept. 9, 2026 that it had attacked 10 ships near the Strait of Hormuz in retaliation for the U.S. military sinking five Iranian oil tankers, according to Reuters reporting compiled in Just Security's Sept. 10 Early Edition. At least one seafarer aboard one of the targeted tankers was reported killed and another was listed as missing. The exchange marked a further escalation in the maritime dimension of the U.S.-Iran war, centered on the narrow waterway through which a large share of the world's seaborne crude oil passes. The attacks were consequential for the United States because they directly threatened global energy supply routes and civilian merchant crews, contributing to the surge in oil prices and fuel costs at home. They also raised the risk of further American military involvement to protect commercial shipping, and drew scrutiny of the legality of U.S. strikes on Iranian vessels. The escalation unfolded alongside separate U.S. and international pressure on Tehran, including an International Atomic Energy Agency board vote to refer Iran to the U.N. Security Council for the first time in two decades.