"... chlorine was likely used ...." Not was used but likely used. This is science? This is propaganda.
Please note how I had to edit in the word "likely" in the Associated Press's false-propagandistic title.
"Medical workers said at the time that the attack killed more than 40 people." Other medical workers with no axe to grind said that the "attack" killed zero people and that the video of victims was completely staged.
False-flag attacks have been a US specialty since before I was born. The CIA has trained countless fascists in the tactic to undermine anti-imperialist nations.