Heavy clashes in Syrian capital Damascus.

A firefight is reported to have erupted in Syria's capital, Damascus, between the rebel Free Syria Army and the forces of President Bashar al-Assad, BBC reported.

Witnesses say the sound of machine-guns and rocket-propelled grenades can be heard from the district of al-Mezze.

The neighborhood, in the centre of Damascus, is home to several security facilities and is one of the most heavily guarded parts of the capital.

In January the Free Syria Army briefly seized several Damascus suburbs.

Al-Mezze has been the scene of large anti-government protests.

The incident follows bomb blasts in Damascus and the northern city of Aleppo over the weekend.

On Sunday a car bomb exploded in Aleppo, killing at least two people and injuring 30 others.

A day earlier, at least 27 people were reported to have been killed and 97 wounded in two explosions in the capital.