Currently it's impossible to find out what substance poisoned people, because we are under complete blockade, and the site of the attack is under fire by the Russians to hide evidence of their crime.” Regardless of the sudden international focus on the chemical attack, he went on to claim that thousands of civilians in the city had been killed and continued to be slaughtered by constant ongoing Russian airstrikes, naval bombardment, heavy flamethrower systems, artillery, and phosphorus munitions.