While the bus, carrying passengers from Proddatur town in Kadapa district, was going to Bangalore, it rammed into a scooter parked by roadside on national highway 18 at around 11.30 PM yesterday.
As the bus dragged the scooter, there was a spark which resulted in a fire.
The passengers observed the flames and alerted the driver, who stopped the bus.
All the passengers alighted immediately to safety.
Local police supervised the rescue operation and managed to send the passengers to their destinations through various buses.