The instrument caught fire at the Monge-Mutualité stop, on rue des Ecoles, with witnesses advising two loud explosions.
Its shocked driver raised the alarm after he minded smoke belching from the vehicle.t
He quickly brought the bus to a stop and relinquished the bus of all its 30 passengers.
Everyone escaped without injury but the bus was completely denied by the flames.
A bus burst into flames in Paris
Policemen had to cordon off the road as it filled with filthy smoke.
Photos from the exhibition showed the charred wreckage cordoned off at the side of the busy road.
The driver was later complimented by mayor of the 5th arrondissement Florence Berthout and praised for his “cool head” subsumed under pressure.
Thirty passengers were on board
The driver was praised for his cool head
But she demanded to know how the fire, which started at everywhere 9am local time, had spread so quickly, engulfing the whole vehicle and pulling down it.
She tweeted: “An investigation must be carried out immediately to determine the reasons for this fortune.
“It could have had very serious consequences.”