A government official in Homs province said 13 civilians were killed in a car bomb explosion at a busy roundabout in a residential district known as the Armenian quarters in the city of Homs. The official said more than 30 others were wounded in the explosion that targeted the area, mostly inhabited by residents from the Alawite and Christian minority sects.
The official spoke on condition of anonymity because he was not authorised to give official statements.
Earlier, the state-run news agency SANA said an explosives-laden car was detonated remotely in an area on the southern edge of Hama, killing at least four people and wounding 22.
The Britain-based Syrian Observatory for Human Rights, which documents the fighting in Syria through a network of activists on the ground, said the blast went off near a security headquarters in Hama, killing five people and wounding more than 20.
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The reports did not say who was behind the blasts and there was no immediate claim of responsibility.
Homs is Syria's third-largest city and has seen some of the heaviest fighting in the 3-year-old conflict.