Moon of Alabama is now reporting that drafters of the report also say-
On July 4 there was another intervention. Fairweather, the chef de cabinet, invited several members of the drafting team to his office. There they found three US officials who were cursorily introduced without making clear which US agencies they represented. The Americans told them emphatically that the Syrian regime had conducted a gas attack, and that the two cylinders found on the roof and upper floor of the building contained 170 kilograms of chlorine. The inspectors left Fairweather’s office, feeling that the invitation to the Americans to address them was unacceptable pressure and a violation of the OPCW’s declared principles of independence and impartiality.