The White House report, however, cited "a wide body of open-source material" and "social media accounts" from the area occupied by foreign-backed militants in the country, including footage provided by the White Helmets rescue group, which has been documented to have ties with anti-Damascus militant groups as well as Western and Persian Gulf Arab governments backing the overthrow of Syrian President Bashar al-Assad. "Our impression is that the West, mainly the United States, is hand-in-glove with the terrorists".
U.S. Central Command said coalition aircraft were given the wrong coordinates by their partner forces, the predominantly-Kurdish Syrian Democratic Forces, for the strike on Tuesday that was meant to target IS militants south of their Tabqa stronghold, near the extremists' de facto capital, Raqqa.
"We can only allow any investigation when it's impartial, when we make sure that unbiased countries will participate in this delegation to make sure that they won't use it for politicised purposes", he said.
The OPCW based in Hague sent their team to collect biometric samples and to interview survivors.
British scientists have tested samples from victims of last week's chemical attack in Syria and claim to have evidence that Sarin gas, or a similar substance, was used in the bombing.
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"Our impression is that the West, mainly the United States, is hand-in-glove with the terrorists", Assad told Agence France-Presse in his first comments since a US missile strike on a Syrian air base in retaliation for the chemical attack.
Rycroft said "samples obtained from Khan Sheikhun" have "tested positive for the nerve agent sarin or a sarin-like substance".
The Syrian government has denied using or even possessing chemical weapons.
Chemical weapons experts have also dismissed a Russian version of events that a Syrian airstrikle hit a terrorist group's weapons depot on the ground, causing a release of deadly gas. The United Kingdom therefore shares the USA assessment that it is highly likely that the regime was responsible for a Sarin attack on Khan Shaykhun on the 4th April. This was verified by the Organization for Prohibition of Chemical Weapons (OPCW). Its findings, expected in 3-4 weeks, will be passed to a joint United Nations-OPCW investigation tasked with identifying individuals or institutions responsible for using chemical weapons.
Global investigators have concluded that Sarin, chlorine and sulphur mustard gas have been used in Syria's six-year-old conflict, with government forces using chlorine and Islamic State militants using sulphur mustard.