"The bus with over 60 passengers was heading to Paonta Sahib when it met with the accident in Nahan sub-division," said Manmohan Sharma, Additional District Magistrate, Sirmour.
The tourists had come from Saharanpur in UP to visit Renuka Ji and were on their way back home when the tragedy struck.
At least 11 people were killed and nearly 48 injured in the accident, said the ADM who rushed to the scene with rescue and medical teams.
A crane had been pressed into service to pull out the bus from the gorge, he said adding rescue operations were on to locate any possible survivor or body.
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The cause of the accident was yet to be ascertained but eye-witnesses said the driver failed to negotiate a sharp bend near Madhara Ghat and the bus rolled down into the gorge.
Chief Minister Vibhadra Singh expressed deep shock and grief over the accident.
He directed the district administration to provide all possible held to the injured.