released on April 18, 2017 I misinterpreted the wind-direction convention which resulted in my estimates of plume directions being exactly 180° off in direction", which was however irrelevant for his main statement, that no sarin could have been emitted at the crater-site. Later in April, Postol wrote that the "French Intelligence Report of April 26, 2017 contradicted the White House Intelligence Report of 11 April 2017". The following day he revised his view, saying he had confused the date and location for a different chemical attack four years earlier. Postol stated that none of the forensic evidence in The New York Times video and a follow-on Times news article on the Khan Shaykhun chemical attack supported the conclusions reported by The New York Times. In 2019, the Princeton based journal Science & Global Security, on whose editorial board Postol sat, intended to publish a report titled "Computational Forensic Analysis for the Chemical Weapons Attack at Khan Sheikhoun on 4 April 2017" about the Khan Shaykhun chemical attack written by Postol, Goong Chen, Cong Gu, Alexey Sergeev, Sanyang Liu, Pengfei Yao and Marlan O. Scully. The report questioned the findings of the OPCW investigation which concluded that the Assad regime had used sarin. The website Bellingcat disagreed with the report's interpretation and stated there were many caveats in the reports analysis. According to Bellingcat, the report's use of simulation was methodologically flawed, as the paper only provided a simulation of a 122mm type rocket, and did not attempt to study other possible options. In response to the Bellingcat article, the editors of Science & Global Security said "Regrettably, the Bellingcat group blog post contains a number of incorrect statements about the contents and conclusions of the paper to be published. Some of the statements appear to refer to an earlier manuscript and do not take account of all the changes made during the peer review and editorial process managed by this journal". The journal later decided not to publish the paper after it "identified a number of issues with the peer-review and revision process". DPRK In August 2017, Postol shared with Newsweek a paper he co-authored with Markus Schiller and Robert Schmucker of Schmucker Technologies which stated that missiles tested earlier in 2017 by the DPRK were incapable of delivering a nuclear warhead to the mainland United States despite being widely described as intercontinental ballistic missiles. Books References External links MIT