Turkey, Russia, Qatar have reaffirmed their commitment to advance the political process in Syria instead of a military solution.
The Syrian Observatory for Human Rights reported "around 3,000 people" returned to the northern Hama and the southern Idlib countryside from other areas under regime control.
UN Syria envoy Staffan de Mistura says the fight against terrorism is "being discussed at the highest possible level." Other matters on the agenda include a new constitution, reformed governance and fresh elections.
Khan Shaykhun, reeling from a suspected chemical attack which killed more than 70 people on Tuesday, was again hit by at least five air strikes on Wednesday.
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