In footage captured, several vehicles can be seen engulfed in flames.

The blast occurred in Via Pier Lombardo at approximately 11.30am local time with a large cloud of black smoke visible from across the city.

According to Italian news publication, La Repubblica, the blast occurred from a parked van which was carrying oxygen cannisters.

The van was parked on the corner of the street and sparked a chain reaction setting five vehicles ablaze, according to reports.

The fire also spread to a nearby pharmacy and apartment

building.