The French Foreign Minister Jean-Marc Ayrault said that samples taken from the attack on the rebel-held town of Khan Sheikhoun matched those from a previous incident.
“We have definite sources that the procedure used to make the Sarin sampled is typical of the methods developed in Syrian laboratories,” he said. “This method bears the signature of the regime, and that is what has allowed us to establish its responsibility in this attack.”
French laboratories had stored samples taken from other chemical attacks in Syria and so were able to compare them, he said.
A tweet posted by the French Foreign Ministry said: “There’s no doubt that Sarin was used. There is also no doubt about the responsibility of the Syrian regime.”
The attack has been widely blamed by Western powers on the Syrian government, which is supposed to have given up its chemical weapon stockpile in 2013 following an attack in the Ghouta area of Damascus that activists say killed 1,400 people.
International chemical weapons inspectors from the Organization for the Prohibition of Chemical Weapons (OPCW) said last week they had found “incontrovertible” evidence that Sarin, or a similar substance, was used
in the April 4 attack on Khan Sheikhoun, but did not apportion responsibility.
UK scientists had already found that Sarin
or a similar chemical had been used in the attack, having tested samples smuggled from the site.
However, Damascus denies it had anything to do with the Khan Sheikhoun attack, instead blaming “terrorist” groups. It also denies it has any chemical weapons.
Russian President Vladimir Putin, a key Syrian ally, has suggested meanwhile that the attack was carried out by “forces” trying to frame the regime
of Syrian President Bashar al-Assad. Moscow also questioned the impartiality of the OPCW.
Kremlin spokesman Dmitry Peskov said Wednesday that Russia would not change its position regarding the Khan Sheikhoun attack in light of the French assessment.
“The Kremlin and President Putin still believe that conducting an impartial international investigation is the only way to find out the truth,” state-run TASS quoted Peskov as saying.
The French Foreign Ministry said its independent investigation, declassified so it could be shared with the world, supported “with certainty” the conclusions also reached by the United States
, United Kingdom, Turkey and the OPCW.
Analysis by French experts of samples from the April 4 attack site and the blood of one of the victims confirmed the use of Sarin, its report said. Those samples were compared with samples from an attack on the northern Syrian town of Saraqeb in April 2013, in which three grenades containing Sarin were dropped by a helicopter, one of which failed to explode, it said. According to the French army, only the Syrian regime had helicopters so it had to be behind the attack.
Scientists established the presence of the same chemical compounds in samples taken from Saraqeb in 2013 and from Khan Sheikhoun, the French Foreign Ministry said. “The Sarin present in the weapons used on April 4 was produced according to the same manufacturing method as that used in the Sarin attack carried out by the Syrian regime in Saraqeb.”
The report also cited the French military’s assessment that a warplane had been deployed from the Syrian regime’s Shayrat airbase on the morning of April 4 and had carried out up to six airstrikes in the Khan Sheikhoun area. “Only the regime has such air assets,” said Ayrault.
“The French intelligence services believe that only Bashar al-Assad and some of the most influential members of his entourage are empowered to give the order to use chemical weapons,” the report added.
The report also describes the claim that rebel forces in the area had Sarin as “not credible.”
It casts doubt on the Syrian regime’s promised destruction of its chemical stockpile, saying that French intelligence services believe “important doubts remain about the accuracy, completeness and sincerity of the dismantling of the Syrian chemical arsenal.”
The chemical attack in Syria prompted the United States to launch its first military strike on the Syrian regime
in the six-year war, causing a major rift between Washington and Moscow.
On President Donald Trump’s orders, US warships launched 59 Tomahawk cruise missiles at the Shayrat airbase, US officials said.
The Khan Sheikhoun incident has led to renewed calls for Assad to be forced from power
, as international ceasefire and peace talks continue to end a conflict which has killed 400,000 people, according to UN data.