"There is an investigation underway (by) the French intelligence services and military intelligence.it's a question of days and we will provide proof that the regime carried out these strikes", Mr Ayrault told LCP television on Wednesday.
The head of a global arms watchdog said today that "incontrovertible" test results from an alleged chemical strike in Syria showed sarin gas or a similar substance had been used.
When the Syrian town of Khan Sheikhoun was hit this month by poison gas, the attack was condemned internationally and prompted the Trump administration to launch a retaliatory missile strike. A senior military official told AP Israeli military intelligence estimates that Assad has "between one and three tons" of chemical weapons.
But it ignored that the body, based in The Hague, is already investigating the April 4 attack on the rebel-held town in Idlib province which left 87 dead, including many children.
A USA official says that Syria has moved all of the aircraft from the airbase that was struck by US missiles two weeks ago to an airbase used by Russian Federation for missions within Syria. All officials spoke on condition of anonymity under military briefing rules. Israel welcomed the strike on its neighbor.
Russia: Talks with U.S. won't lead to immediate action
Peskov also said Putin had given Tillerson his views on the situation in Syria, and how it was likely to develop. He said earlier he would ask The Hague and the global community to investigate the allegations.
The attack in Khan Sheikhoun has been widely blamed on the Syrian government, though Damascus denies it had anything to do with the attack and also denies it has any chemical weapons.
Assad agreed in 2013 to declare and dispose of all his chemical weapons under United Nations supervision, but his forces have repeatedly been accused of using them since then.
The Post, citing a defense official, also said the regime used the chemical weapons out of frustration after failing to make meaningful advances on the ground despite support from Russia, Iran and Hezbollah. The OPCW was in 2013 responsible for overseeing the destruction of Syria's chemical weapon stockpile, following an attack in the Ghouta area of Damascus that activists say killed 1,400 people. But doubts began to emerge soon afterward that not all such armaments or production facilities were declared and destroyed.
The UN said sarin had been used in that attack, which killed hundreds of people in the Ghouta agricultural belt to the west and east of the capital.
In response to the April 4 attack, the United States fired 59 missiles at a Syrian air base it said was the launching pad for the attack.