Tensions escalated in southern Syria's Deraa province after government troops and armed volunteers launched a raid against opposition fighters controlling parts of Al-Sanamayn townOn Monday, after a day of heavy shelling and fighting led by the Fourth Division of Maher al-Assad, brother of Syrian President Bashar al-Assad, an agreement was brokered by Russia that saw two dozen opposition fighters leave the town for opposition-held areas in the country's northwest, local residents told Al Jazeera.