At least 12,000 people were killed in the largest killing in Iran’s contemporary history, carried out largely over two consecutive nights on January 8 and 9, Iran International’s editorial board concluded, based on a review of sources and medical data. Iran is under a coordinated blackout aimed not only at security control but at concealing the truth, reflected in internet cuts, crippled communications, media shutdowns, and the intimidation of journalists and witnesses. Publication was delayed until the evidence converged. The assessment is based on a multi-stage review of information from a source close to the Supreme National Security Council; two sources in the presidential office; accounts from several sources within the Islamic Revolutionary Guard Corps in Mashhad, Kermanshah and Isfahan; testimonies from eyewitnesses and families of those killed; field reports; data linked to medical centers; and information provided by doctors and nurses in multiple cities. iranintl.com/en/202601136877