But Russian Foreign Minister Sergey Lavrov, who was at the joint news conference with Fabius, brushed aside the question when asked who was to blame.
United Nations chemical weapons inspectors were not in Syria to assign blame for the attack, Lavrov said.
It’s the latest diplomatic volley as world leaders try to reach a consensus on what to do about Syria.
Just days after Russia and the United States reached a deal on getting Syria to give up its chemical weapons, the global bickering has ramped up again.
The plan has to be sanctioned as a U.N. resolution, and the devil is in the details.