Syrian state-run media say at least 28 people have been killed and 200 others injured in two car-bomb explosions in the northern city of Aleppo.
State-run television blamed the February 10 attacks on what it called "armed terrorist gangs," and said at least one of the explosions was triggered by a suicide bomber.
The television said one of the attacks targeted a police station, the other an intelligence base.
The broadcaster blamed the attack on what it called "armed terrorist gangs."
The rebel Free Syrian Army has accused the regime of President Bashar al-Assad of masterminding the bombings in a bid to tarnish the rebels' image.
Antigovernment activists said three explosions had occurred in Aleppo, two of them targeting security-force bases.
Aleppo has been relatively quiet since protests against Assad's rule erupted in March.
In another development, government forces pressed ahead with an onslaught on the central city of Homs.
Activists have reported that tanks on February 10 moved into a neighborhood in Homs, as security forces continue their offensive against opposition protesters in the area.
Opposition activists say hundreds of people have been killed in Homs since the offensive began a week ago.
Assad's regime is facing increasing Western pressure over its 11-month-old crackdown against opposition protesters, which is estimated to have left upward of 6,000 people dead.
The Russian-backed Syrian government has blamed the unrest on a foreign conspiracy and says armed gangs and terrorists are leading the revolt, not protesters seeking democratic change.
Compiled from agency reports