A helicopter hovers above al-Bab Aleppo -- a warning sign of what's to come.
The Syrian army bombarded the rebel-held town for a second day in a row. Rights groups say at least 20 people were killed on Sunday, after the government dropped improvised barrel bombs on a market district. It came a day after 26 were killed in a similar attack on the same town by President Bashar al-Assad's forces.
Barrel bombs - are typically rolled out of the back of helicopters and are rarely delivered with any accuracy.
The video which can not be independently verified shows the carcasses of destroyed buildings.
Syria's state news agency said the army had destroyed "several terrorist dens" including the headquarters of one Islamist group.
Rebel forces are fighting to the finish. The bombardment of Al-Bab, just north east of Aleppo city follows gains by Assad's forces in south-east Aleppo last month and could herald a similar ground offensive in the area.
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