The latest news here is that the lorry was carrying CO2 bound for the Coca-Cola plant.

The CO2 is used to carbonate the sodas we drink...

It is always transported at very low temperatures so that it will be more dense. Increased density means that it can carry more in a given vessel.

In this unfortunate accident, when the lorry turned to its side, the vessel carrying the super cold CO2 ruptured, causing a very sharp spike in temperature; which caused the CO2 to expand into catastrophic proportions, thereby creating that explosion. The explosion was not caused by combustion but just a very very fast expansion of gasses because of the sharp rise in temperature...

The lawyers for the company that owns the lorry was putting a terrorist spin to this so that they will not pay for the expenses of the unfortunate victims of this accident...