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President Emmanuel Macron said Tuesday that "France will strike" if chemical weapons are used against civilians in the Syrian conflict in violation of international treaties, but that he had not yet seen proof this was the case, The Telegraph reported.

Macron said last May that the use of chemical weapons would represent a "red line". In a telephone call with Russian President Vladimir Putin on Friday he expressed concern over signs that chlorine bombs had been used against civilians in Syria.

"On chemical weapons, I set a red line and I reaffirm that red line," Macron told reporters. "If we have proven evidence that chemical weapons proscribed in treaties are used, we will strike the place where they are made."

"Today, our agencies, our armed forces have not established that chemical weapons, as set out in treaties, have been used against the civilian population."

The Syrian government has repeatedly denied using chemical weapons and said it targets only armed rebels and militants.