The last fighter to die in combat was killed in Syria last week.
Riot police fired tear gas to disperse crowds who were demonstrating against the use of chemical weapons in the Syrian city of Idlib.
The first reported use of the nerve agent was reported in Idlib on April 17, but the death toll is now at least 13.
Many of those killed in the last three days have been civilians, as opposed to fighters.
They include an infant boy in Aleppo and two young women who were killed by shelling.
The death toll has been rising in Syria as the war drags on and more than 1,500 people have been killed.
In Idlib, the government has said its forces were in control of Idlib at the time of the attack on April 18.
The city has been the center of a civil war since 2012.
In a statement, the Syrian Arab Red Crescent said more than 80 people were killed in clashes between government forces and protesters, including more than 20 children.
The Syrian Observatory for Human Rights said at least 45 people died and scores were injured in Idlib.
More: The Observatory also said Syrian troops and pro-government militias launched an offensive on the northern town of Deraa on April 22, launching a large-scale offensive against residents who refused to leave the area.
More than a dozen Syrian military vehicles were reported destroyed in the battle.
Syrian state television said the army had captured Deraa from rebels.
It said government forces had seized a number of villages.
A pro-regime website posted a video purporting to show rebels and government forces on the ground in Deraa.
The Syrian Civil Defense reported at least seven casualties in Deraias military offensive.
A rebel group said rebels had captured the town of Khashahat al-Mansoura in Idlib province.
Syria’s state news agency SANA said at a news conference on Friday that more than 100 fighters from different rebel groups were in the city.
Russia and the United States have been negotiating for a cessation of hostilities in Syria since the start of the conflict in March 2011.
Syria has been at war with opposition forces since 2011, when a chemical weapons attack killed hundreds of people in the country’s capital.
More than 1.7 million people have fled their homes in the war-torn country.
A government spokesman in Damascus, speaking on condition of anonymity, said the military was now carrying out operations to defend the capital and to seize the territory it lost to the rebels.
The military said on Friday it was in control.