Rekha Rawat (33) and her two-and-a-half-year-old daughter were aboard a sleeper bus headed for Barmer from Jaipur.
The bus caught fire soon after it left Balotara city, where it had halted for a brief period, Pachpadra police station SHO Devendra Singh said.
The bus was being evacuated after the fire was detected near Khed village in Barmer, Singh said. Twelve passengers were able to get down but the fuel tank exploded while Rekha and her daughter were still on the bus, he added.
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