In 1980, the U.S. Defense Intelligence Agency filed a report stating that Iraq had been actively acquiring chemical weapons capacities for several years, which later proved to be accurate. In November 1980, two months into the Iran–Iraq War, the first reported use of chemical weapons took place when Tehran radio reported a poison gas attack on Susangerd by Iraqi forces. The United Nations reported many similar attacks occurred the following year, leading Iran to develop and deploy a mustard gas capability. By 1984, Iraq was using poison gas with great effectiveness against Iranian "human wave" attacks. Chemical weapons were used extensively against Iran during the Iran–Iraq War. On January 14, 1991, the Defense Intelligence Agency said an Iraqi agent described, in medically accurate terms, military smallpox casualties he said he saw in 1985 or 1986. Two weeks later, the Armed Forces Medical Intelligence Center reported that eight of 69 Iraqi prisoners of war whose blood was tested showed an immunity to smallpox, which had not occurred naturally in Iraq since 1971; the same prisoners had also been inoculated for anthrax. The assumption being that Iraq used both smallpox and anthrax during this war.
In 1980, the U.S. Defense Intelligence Agency filed a report stating that Iraq had been actively acquiring chemical weapons capacities for several years, which later proved to be accurate. In November 1980, two months into the Iran–Iraq War, the first reported use of chemical weapons took place when Tehran radio reported a poison gas attack on Susangerd by Iraqi forces. The United Nations reported many similar attacks occurred the following year, leading Iran to develop and deploy a mustard gas capability. By 1984, Iraq was using poison gas with great effectiveness against Iranian "human wave" attacks. Chemical weapons were used extensively against Iran during the Iran–Iraq War. On January 14, 1991, the Defense Intelligence Agency said an Iraqi agent described, in medically accurate terms military smallpox casualties he said he saw in 1985 or 1986. Two weeks later, the Armed Forces Medical Intelligence Center reported that eight of 69 Iraqi prisoners of war whose blood was tested showed an immunity to smallpox, which had not occurred naturally in Iraq since 1971; the same prisoners had also been inoculated for anthrax. The assumption being that Iraq used both smallpox and anthrax during this war.