At least 21 civilians have been killed in airstrikes in Idlib amid a continuing offensive by Bashar al-Assad’s forces, despite a supposed ceasefire in Syria’s last opposition-held province.

The strikes, carried out by the Syrian air force and its Russian allies, hit a market and industrial zone in Idlib city in a ferocious attack on Wednesday that destroyed several buildings and set cars on fire, leaving the torched corpses of motorists trapped inside.

Footage from the scene showed houses on the same street levelled as rescue workers struggled to free those trapped under the rubble.