The United States and Israel initiated strikes on Iran over one month ago, on February 28, 2026. The attack was a clear violation of the United Nations Charter. The conduct of the war, and statements of U.S. officials, also raise serious concerns about violations of international humanitarian law, including potential war crimes. We have written the below statement together with over 100 U.S.-based international law experts, to detail our profound concerns about the war. The letter is signed by international law experts across the United States, including senior professors; leaders of prominent international law associations, non-governmental organizations, and legal clinics;...