A series of barrel bombs dropped from Syrian regime helicopters killed at least 71 civilians and wounded dozens of people in the northern province of Aleppo.
Syrian Observatory for Human Rights chief Rami Abdel Rahman said the bombs on Aleppo city struck the rebel-held eastern neighbourhood of Al-Shaar, killing 12 people including eight members of a single family.
Bulldozers were used to clear away the rubble by civil defence volunteers.
The other 59 civilians, all men, were killed at a market in Al-Bab, Abdel Rahman told AFP.
Al-Bab lies about 40km northeast of Aleppo city and is controlled by the extremist so-called Islamic State group.
Those killed were all male because women have much less freedom of movement in IS-controlled areas, he added.
The Observatory said the death toll in Al-Bab was likely to rise, as many wounded civilians were in critical condition and another 18 were still unaccounted for.
Barrel bombs are crude weapons made of oil drums, gas cylinders or water tanks packed with explosives and scrap metal that are usually dropped from helicopters.
The Syrian government's use of the weapons has come under fire by rights groups, who say barrel bombs are indiscriminate and often kill many civilians.
Elsewhere, at least six regime loyalist forces were killed and 10 wounded in an explosion Friday night in Tadamon, south of the Syrian capital, said the Observatory.
The neighbourhood has seen an influx of refugees from nearby Yarmuk, after IS militants overran the Palestinian camp in April.
