A car bomb blew up on Sunday in the northern Syrian city of Aleppo, killing three civilians and wounding more than 25 others, a day after two lethal blasts in the capital, a monitoring group said.
The Syrian Observatory for Human Rights, in a statement updating an earlier report to give the casualty toll, said the blast struck near the city's political security offices.
In Damascus, state news agency SANA said a "terrorist" car bomb exploded between two residential buildings in the Sulaiymaniyah district of Aleppo without giving an immediate report of casualties.
The attack left dead and wounded, state television reported, without giving a precise casualty toll. It showed footage of damaged buildings and destroyed cars.
Activists in Aleppo, the target of car bombings on February 10 that killed 28 people, told AFP in Beirut on Skype that the latest blast rocked the city at 12:50 pm (1050 GMT).
On Saturday, twin car bomb blasts killed 27 people and wounded 140 others in the heart of Syria's capital, mostly civilians, the interior ministry said, blaming "terrorists" for the attacks near police and air force headquarters.