US President Barack Obama said a "majority" of world leaders believe that Bashar-al Assad's regime used chemical weapons.
He added that it was "unanimous" among the leaders that chemical weapons were used in the country.
The G20 summit in St Petersburg exposed stark divisions between host Vladimir Putin and US President Obama over Syria.
War emptied the suburb of Yarmouk in southern Damascus of its people. Assad's army holds it, but their prize is a ghost town.
Even in the President's heartland of Baltimore, 95% of voters are against his policy on military intervention in Syria.