Analysis of information sources in references of the Wikipedia article "1988 executions of Iranian political prisoners" in Simple English language version.
It is estimated that as many as 30,000 individuals may have been executed at that time, in response to a religious edict issued by Ayatollah Khomeini that there was no room for apostates in his Islamic republic. Ayatollah Montazeri also alluded to this tragedy in his memoirs (published in 2001) and the Iran Human Rights Documentation Center's detailed report on the executions notes that estimates of those killed range from 1,000 to 30,000. See IHRDC, Deadly Fatwa: Iran's 1988 Prison Massacre (New Haven, CT: IHRDC, 2009). The insider's account is provided by Ayatollah Hossein-Ali Montazeri, Khatirat-i Ayatollah Montazeri, Majmu'iyyih Payvastha va Dastnivisha [Memoir of Ayatollah Montazeri, the Collection of Appendices and Handwritten Notes] (2001).