The UN Syria envoy on Thursday criticised a Damascus "strategy" of forced evacuation from Daraya following a brutal four-year government siege, warning that more besieged towns could follow. 

Staffan de Mistura told reporters in Geneva that there were "indications that after Daraya we may have other Darayas," adding that "there is clearly a strategy at the moment to move from Daraya" to other besieged areas "in a similar pattern."