Rome's Buses On Fire?

There were 63 people riding on the bus, and is the ninth time this happened this year, following the twenty two times it happened last year. This happened on Tuesday, May 7th, 2018.
=== On social media, journalist Raffaella Menichini said, "Only in Rome does a bus explode in the heart of the city and people immediately blame Atac, with no thought of terrorism. It says a lot about our emergencies." ===

How Dangerous Are These Fires?
=== The city of Atac states that no passengers got hurt, and that is true but local media reported that a shop assistant working near by the place where the bus got on fire was taken to the hospital because of a burn to the arm and shock. ===