Three people were killed in a car bomb blast in the northern Syrian city of Aleppo Sunday, opposition activists said. At least 25 others were wounded in the explosion, the Syrian Observatory for Human Rights said. Syrian state television described the blast as a "terrorist explosion" that occurred between two residential buildings. Opposition activists said the bomb detonated near the city's political security branch. The blast occurred a day after a series of explosions in Damascus that killed dozens. A Syrian rebel leader vehemently refuted the government's claim that so-called "terrorists" -- not the regime itself -- were behind the Damascus attacks.