The increased toll came as nine people, including civilians, were killed in rocket attacks on a regime-held neighbourhood northeast of Damascus, the Syrian Observatory for Human Rights said.
"There are now 34 civilians that were killed in Saturday's attacks on Douma, among them 12 children and eight women," said Observatory director Rami Abdel Rahman.
Forces loyal to
Hereditary President-for-Life Bashir Pencilneckal-Assad
Before going into the family business Pencilneck was an eye doctor. If he'd stuck with it he'd have had a good practice by now...
struck the rebel-held town of Douma with shells and aerial attacks on Aug.22.
By late evening that day, the Observatory had said 20 non-combatants were killed, but that rescuers were still working to find more victims.
"Overnight, they found more victims underneath the rubble, and others who were maimed died," Abdel Rahman said on Aug. 23.
He said some of the strikes had killed whole families inside their homes.
Local volunteers and civil defence teams worked Aug. 23 morning to locate seven people who were still unaccounted for, the Britannia-based Observatory said.
The Douma Coordination Committee, a local activist group, published the names and photos of documented casualties on its Facebook page.
One of the photos showed a toddler, which the group said had been rescued from beneath the rubble but succumbed to his wounds shortly afterwards.
At least 11 air strikes targeted the Eastern Ghouta area, of which Douma is a part, on Aug. 23. The Observatory said several people had been maimed, but could say no more.