These clashes are on 15-7 in Damascus locals described as the most violent in the capital since the outbreak of armed conflict by force attempt to overthrow the president Bashar al-Assad initiated after since the conflict broke out in the country 16 months ago.
Committee of the International Red Cross (ICRC) said the severity of armed conflict.
ABC said the fighting broke out in the suburbs of Damascus in the context of UN observers back to the village Tremesh investigate the claims of the opposition, that 200 people were killed in a massacre in this.
UN envoyalso wrote to Syria's Foreign Ministry said the use of artillery against the peace efforts of the United Nations.
ABC quoted witnesses said Syrian troops have blocked roads and airports to encircle the insurgents in the south of Damascus as al-Hajar al-Aswad and Tadamon.
Rebel forces close in on 15-7 says conflict has left at least 55 people were killed across Syria.
In most conflicts, the ICRC is the only international forces deployed in Syria to move relief food, medicines and other assistance. All parties to an armed conflict are obliged to respect international law on human rights and the laws of war, the ICRC.