On Thursday, Macron said he had "proof" that Syrian President Bashar al-Assad's regime had used chemical weapons in Saturday's attack on Douma, the main city in the longtime rebel bastion of Eastern Ghouta, and that the United States and France would response "in due course".
However, he repeatedly warned that he would intervene militarily if alleged use of chemical arms would be proved.
On Tuesday, the OPCW announced that at the invitation of the Assad government, and with urging from the Russian Federation, it would deploy an investigative team to Syria. As part of its mandate, the OPCW does not release information pertaining to an investigation while that investigation is ongoing.
He there was "no doubt" Syrian President Bashar Assad's regime was responsible. That acknowledged that Syria had crossed a red line that Mr Macron set previous year promising French military action if the use of gas was confirmed.
"This persistent pattern of behavior must be stopped - not just to protect innocent people in Syria from the horrific deaths and casualties caused by chemical weapons but also because we can not allow the erosion of the worldwide norm that prevents the use of these weapons", May said in a statement.
British Prime Minister Theresa May also said she had authorised British forces to conduct strikes against Syria.
Macron, who tweeted a picture of himself in a meeting room with military and diplomatic advisers, said a debate about France's military involvement would take place in parliament.
It was not immediately clear whether the planes were taking off from an aircraft carrier or a military base on land.
The air strikes are over but the military is ready to act upon request, the source said.
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