Yesterday’s fire came despite UN condemnation of a massive barrage the previous day that killed at least 36 civilians, 14 of them children.
The Syrian Observatory for Human Rights said there were also “many” wounded but did not immediately give a figure.
Control of Aleppo is divided between rebels in the east, and forces loyal to President Bashar al-Assad in the west.
Both sides frequently bombard each other but Observatory director Rami Abdel Rahman told Agencies that Monday’s deaths marked “one of the highest tolls in opposition attacks in Aleppo city”.
Damascus called on the UN Security Council to condemn the rocket fire and address the problem of “terrorist groups.”
In the south, government aircraft pounded the rebel-held town of Eastern Ghariyah in Daraa province late on Tuesday, killing 18 people, 14 of them children.
“The children were killed while at a centre for the study of the Koran,” the Observatory said.
It said the death toll was likely to rise, as many of the wounded were in a critical condition.
(AGENCIES)