The report, press release, and a graphic have been corrected to reflect the following changes:
- Human Rights Watch identified bomb fragments from the impact crater associated with the attack as consistent with a 250 kilogram Soviet-manufactured chemical munition. We described this munition as most likely a "KhAB-250," an abbreviation of the commonly used Russian term Khimicheskaya Aviatsionnaya Bomba, or “Chemical Aviation Bomb." However, the official nomenclature for this class of weapon is inconsistent, and we have removed the term "KhAB-250" from the report and press release to avoid confusion. We have also updated the report to reflect that the Soviet Union produced several types of chemical munitions, rather than two types as we originally said. A new appendix sets out in further detail the available information about sarin bombs produced by the Soviet Union.
- The original version of this report incorrectly recorded the measurements of the impact crater in the road in Khan Sheikhoun recorded by Forensic Architecture as 1.62 centimeters in diameter and 0.42 centimeters deep. The unit of measure has been corrected to be meters, not centimeters.
- Members of the al-Youssef family and other sources provided Human Rights Watch with the names of 25 people from the al-Youssef family they believed to be dead. Two of the people on the list were injured, but survived, bringing the number of the dead to 90, not 92.