Twenty people were burnt alive in a horrific tragedy on Tuesday afternoon when a private bus travelling from Jaisalmer to Jodhpur in Rajasthan caught fire, the police said. Police said the bus, carrying 57 passengers, left Jaisalmer around 3 pm. On the Jaisalmer-Jodhpur highway, smoke began emerging from the rear portion. The driver stopped the bus along the roadside, but within moments, the flames engulfed the vehicle.