Despite a rescue operation made by the police and fire brigade personnel for over four hours, no trace of the duo was found till late evening, sources said.
Police said K Punala Rao (45), a lorry driver and his son P Gangajalam (19) of Medapeta area arrived here during noon carrying a truck-load of wheat to a Jagatpur-based flour mill.
"Unable to bear the scorching heat of the day, the duo went to take bath in the Balisahi ghat of the river," police said.
