France wants to start working "right now" on resuming the political process aimed at ending the conflict in Syria, the French foreign minister said Saturday, following air strikes by Western powers against the regime of President Bashar al-Assad.

"A plan for ending the crisis must be found, with a political solution. We are ready to start working right now with all countries who want to participate," Foreign Minister Jean-Yves Le Drian told a press conference.

U.S., British and French forces hit Syria with air strikes early on Saturday in response to a suspected poison gas attack that killed more than 70 civilians last week, in the biggest intervention by Western powers against Syrian regime leader Bashar al-Assad.

Meanwhile on Saturday, France released declassified national intelligence report outlining evidence of Assad regime's chemical attacks in Syria's Douma, which said military officials coordinated use of chemicals containing chlorine.

The report by the French intelligence said that analysis of testimonies, photos, videos after Douma attacks enabled conclusion "with high confidence vast majority are recent, not fabricated."

French services have no information to support theory armed groups in eastern Ghouta would have sought to acquire or possessed chemical weapons, it added.