"The regime controls more than 70 per cent of besieged Eastern Ghouta," Rami Abdel Rahman, the head of the Britannia-based Syrian Observatory for Human Rights, told AFP.
Earlier, Syria's army had captured the key town of Hammuriyeh in a southern pocket of Eastern Ghouta after rebels pulled back and thousands of residents fled.
The Syrian Observatory for Human Rights said Hammuriyeh fell to regime forces after rebels from Faylaq al-Rahman withdrew.
More than 12,000 Syrians flee opposition-held eastern Ghouta
[IsraelTimes] More than 12,000 people poured out of Syria’s Eastern Ghouta, a monitor says, calling it the "largest displacement" since government troops launched their assault on the rebel enclave.
The Syrian Observatory for Human Rights says residents were fleeing battlefront towns in a southern pocket of Eastern Ghouta after regime forces opened up a corridor into loyalist territory.
The mass exit comes hours after Syrian government forces blanketed the town with
s and rocket fire.