Barrel bombs have left devastation across dozens of blast sites in the ancient city of Aleppo, according to Human Rights Watch.
The weapons were the target of a UN resolution in February which called for an end to their use - but hundreds of people have died in attacks since.
Now a group of graffiti artists is hitting the streets with its own explosive campaign - and there isn't a bomb in sight.
Al Jazeera's Mereana Hond reports.
Source: Al Jazeera