Censor.NET reports citing Human Rights Watch report.
"What appears to be repeated use of nerve agents undermines Syrian and Russian officials' claims that the chemical exposure in Khan Sheikhoun was due to a conventional bomb striking toxic chemicals on the ground. It would not be plausible that conventional bombs struck chemical caches repeatedly across the country, the report says.
"Photos and videos of weapon remnants that struck Khan Sheikhoun on April 4 appear to be consistent with the characteristics of a Soviet-made air-dropped chemical bomb specifically designed to deliver sarin.
"The United Nations Security Council should immediately adopt a resolution calling on all parties to fully cooperate with investigators from the Organisation for the Prohibition of Chemical Weapons and adopt sanctions against anyone UN investigators find to be responsible for these or past chemical attacks in Syria," the report says.
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