Rebels seized a town in southern Syria from groups loyal to Islamic State just a day after fighters captured another town from the hardline militants in a separate insurgent assault in the north, a rebel source and a monitoring group said.
Syrian rebels in the country's northwest said they came under attack from government ground forces at 4 a.m. (0200 GMT) on Saturday in what they called a breach of the cessation of hostilities plan that came into effect at midnight.
The government of Syrian President Bashar Al-Assad and rebel groups accepted a plan for a cessation of hostilities to begin on Saturday and the US warned it would be hard to hold the country together if the fighting did not stop.
Syrian President Bashar al-Assad said on Saturday he was ready for a ceasefire, on condition "terrorists" did not use a lull in fighting to their advantage and that countries backing insurgents halted support for them.
A United Nations envoy halted his attempts to conduct Syrian peace talks on Wednesday after the army, backed by Russian air strikes, advanced against rebel forces north of Aleppo, choking opposition supply lines from Turkey to the city.
Islamic state militants killed dozens of people execution style in attacks on government-held areas in Syria's city of Deir al-Zor on Saturday, a source and a monitoring said.
A source close to the Syrian government side said
Rebels wrested back a flashpoint town in central Syria on Friday, reversing the last of the gains the army had made in a month-old offensive in Hama province, a monitoring group said.
The Islamist rebels overran Atshan and surroun
Syrian troops backed by Hezbollah and Iranian fighters made advances on Saturday in their offensive to retake territory around the northern city of Aleppo from insurgents and jihadist fighters, a monitoring group said.
Syria's army along with Iranian and Hezbollah allies will soon launch a ground attack supported by Russian air strikes against insurgents in the Aleppo area, two senior regional officials told Reuters on Tuesday.
Control of Al
Russia said on Saturday it had stepped up its bombing campaign against Islamic State militants in Syria, while local observers said several of the air strikes had hit areas in western Syria where the hardline group has little presence.