According to documents reviewed by Iran International, over 36,500 Iranians were killed by security forces during a two-day crackdown on nationwide protests, making it the deadliest protest massacre in history. The killings were carried out by IRGC and Basij forces, with reports indicating that proxy forces from Iraq and Syria were also used. The death toll is based on classified documents, field reports, and accounts from medical staff, witnesses, and victims' families. The Iranian government has not released an official death toll, and the actual number of deaths may be even higher.