At least 13 Syrian civilians were killed  and dozens more injured as a barrage of mortar shells hit several cities in the country.
At least 10 people were killed on Wednesday when mortars hit in and around the capital Damascus, Syria's official news agency SANA reported.
The Syrian Red Crescent Society said its teams had transferred 50 injured people to hospitals across Damascus.
The aid agency said it has been on high alert since the mortars landed in several areas in the city and its outskirts.
One person was killed in a similar attack that took place in the northwestern city of Aleppo.
Militant mortar fire claimed two more lives when it targeted a funeral in the southwestern city of Sweida, close to the border with Jordan.
Syrian cities have been repeatedly targeted by bombings and mortar attacks since the deadly civil war began in March 2011. 
In a new report released on Tuesday, the Syrian Observatory for Human Rights put the death toll for the ongoing crisis in Syria at 150,344 . The London-based group said 51,212 of the victims were civilians, including 7,985 children.
The United Nations says a total of 7.8 million Syrians have been displaced  as a result of the conflict in the Arab country.