Syria's opposition on Saturday said it had agreed to the "possibility" of a temporary truce, provided there were guarantees Damascus's allies including Russia would cease fire, sieges were lifted and aid deliveries allowed country-wide.

Various factions "expressed agreement on the possibility of reaching a temporary truce deal, to be reached through international mediation," a statement from the High Negotiations Committee said.

It said the United Nations must guarantee "holding Russia and Iran and sectarian militias ... to a halt to fighting".

All sides should cease fire simultaneously and the government should release prisoners, it added.-Reuters