London-based monitoring group the Syrian Observatory for Human Rights (SOHR) said on Saturday that at least 39 civilians were killed and dozens were wounded in a series of air strikes on the city of Raqqa in northern Syria.
Additionally, five DAESH terrorists were killed during an aerial bombardment, SOHR said.
The watchdog said it was not clear whether the Syrian regime or Russian warplanes had conducted the air strikes. Seven women and five children were reportedly among the dead and more than 50 civilians were wounded.
Warplanes commit 2 massacres in the city of al-Raqqa and kill more than 50 civilians https://t.co/2LKLeyysxk
— #المرصدالسوري #SOHR (@syriahr) March 19, 2016
A cessation deal in Syria took effect three weeks ago, reducing violence but not halting the fighting as peace talks take place in Geneva.
The deal does not include the DAESH terrorist organisation and Al Qaeda affiliated al Nusra Front.
SOHR also said that 16 people were also killed in air strikes in Raqqa on Friday.
Russian President Vladimir Putin ordered his military to start the withdrawal of the main part of Russia's forces from Syria, saying on Monday that the Russian military intervention had largely achieved its objectives.
The Russian air campaign was started late last year in support of Syrian regime leader Bashar al Assad amid a five-year-long civil war that has claimed more than 470,000 lives and caused millions of Syrians to flee the country.
The Observatory also said Russian warplanes carried out dozens of air strikes in and around the historic city of Palmyra on Saturday.
It said 70 raids had hit the city and its immediate vicinity, with no immediate reports of casualties.
Regime forces and their allies are aiming to capture Palmyra, some 200 km southwest of Raqqa. Palmyra has been held by DAESH since May.