"France will take no unilateral and isolated decision. We have a duty of truth since we have in hands the information (of chemical arms use), but it is now up to the international community," Vallaud-Belkacem, also the French minister for women's rights, said after a weekly cabinet meeting.

　　In an interview with the state-run TV channel France 2 on Tuesday, top French diplomat Laurent Fabius stressed that Syrian officials have "undoubtedly" crossed a "red line" after analysis proved that "the sarin gas was used in Syria several times."

　　Fabius added France, the United States and Britain were discussing how to react and all options, including military action, were on the table.

　　The Syrian government has denied using chemical weapons and accused rebels of deploying them in the two-year civil war that left more than 80,000 victims.

　　The U.N. commission of inquiry on Syria said it examined four reported toxic attacks in March and April but could not determine which side was behind them.