The United States is responsible for an attack on an Iranian primary school that killed at least 170 people, most of them children, Amnesty International has said in a new investigation, urging accountability for the assault. The rights group said on Monday that a US-manufactured Tomahawk missile was likely used in the attack on the school in the southern city of Minab on February 28. “The fact that the school building was directly targeted and was previously part of the IRGC compound raises concerns that US forces may have relied on outdated intelligence and failed in their obligation to do everything feasible to verify that the intended target was a military objective. United Nations experts have described the school attack as “a grave assault on children” while US Democratic lawmakers have urged the Trump administration to “provide clear answers to the American public and Congress about how and why this tragedy unfolded”. US Defense Secretary Pete Hegseth suggested earlier this month that Washington would not abide by “stupid rules of engagement” in its military offensive against Iran. “America, regardless of what so-called international institutions say, is unleashing the most lethal and precise air power campaign in history,” Hegseth told reporters on March 2.