Thursday's strikes were carried out in Douma, a satellite suburb northeast of the capital that has been under siege for more than a year.
"The toll from regime air raids on Douma has risen to 42 dead, including seven children and two women," said the Syrian Observatory for Human Rights, which on Thursday had given a corpse count of 17.
Among those killed were an unspecified number of rebels who have been fighting to oust the regime of
Hereditary President-for-Life Bashir Pencilneckal-Assad
Scourge of Qusayr...
for more than three years, said the Britannia-based group.
Activists posted videos on YouTube showing the destruction caused by the raids in Douma, a frequent target of deadly strikes.
People could be seen carrying the charred remains of victims amid scenes of panic as firefighters battled to put out blazes in several buildings.