The warplanes targeted the city's Sheikh al-Doshel mosque in the city controlled by Syrian National Army (SNA) for the first time since 2017.
On Saturday Assad artillery shells shelled al-Bab city, injuring 16 civilians and causing severe material damage.
Russian warplanes also targeted on Saturday Tel al-Nabareez village in Aleppo countryside, killing a civilian and injuring another.
The SNA forces launched an offensive on the Tadef front south of al-Bab early Saturday, seizing two joint Russian and Assad checkpoints in the Shaala radar base. Several Assad militiamen were also captured alive in Tal Rahhal.
Opposition fighters killed and injured dozens of Assad militiamen and captured and destroyed Assad tanks in Aleppo countryside.
The Syrian Network for Human Rights SNHR documented in its report released on (January 1) 43 massacres committed by Assad regime's militias and 22 massacres committed by Russian forces in 2019.
The report documented the deaths of 3,364 civilians in 2019, including 842 children and 486 women at the hands of the perpetrator parties to the conflict in Syria, including 234 in December.