At least 13 people, including 10 police officers, were killed by a car bomb in a town outside Damascus, the opposition Syrian Observatory for Human Rights said Monday.
The car bomb was detonated outside a police station in Deir Atiyeh on Sunday night, the group's director, Rami Abdel Rahman, told Efe by telephone.
A child was among those killed in the attack and dozens of people were wounded.
Syria's official media outlets have neither confirmed nor denied the reports.
Security forces, meanwhile, attacked a vehicle carrying workers from Idlib, the capital of the like-named northern province, to the town of Maarrat al-Numan.
At least four people died in the attack, the Syrian Observatory for Human Rights said.
Bombardments and fighting killed at least 29 people in the province on Sunday.
Independent confirmation of the casualty figures was not possible due to restrictions imposed on journalists by the government.
Some 93,000 people have died in Syria since the conflict started in March 2011, the United Nations says. EFE