Syrian state media and opposition activists said a car bomb exploded outside a mosque in Homs Province on December 2, killing at least seven people.
Syrian state news agency SANA put the death toll at 15, adding that 24 people had been wounded.
It is impossible to independently verify information coming out of Syria.
Homs has seen considerable fighting and violence during Syria's 20-month uprising against the government of President Bashar al-Assad.
The London-based Syrian Observatory for Human Rights also reported that Syrian forces were firing on insurgent positions near Damascus with artillery and air strikes.
The rights monitor also said 182 people -- 76 insurgents, 68 civilians, and 38 soldiers -- were killed in violence on December 1.
Based on reporting by AFP, Reuters, and AP