Picture used for illustrative purposes only.
The vehicle was travelling along a treacherous mountain highway in Uttarakhand state when it careened over an edge and plunged at least 500 metres (1,640 feet) with around 45 people onboard.
"Twenty people have been rescued," the state's top police official Ashok Kumar told the media.
Prime Minister Narendra Modi said that "all possible assistance" would be given to the survivors. "In this tragic hour my thoughts are with the bereaved families," he tweeted on Wednesday.
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Nearly two dozen people were killed in June when their bus plunged into a gorge while en route to a shrine to the Hindu deity Yamuna, north of the state capital Dehradun.
India accounts for 11 percent of the global road death toll despite only having one percent of the world's vehicles, according to a World Bank report released last year.
The same report estimated 150,000 car crash fatalities in India annually, or one person every four minutes.
It added that road crashes cost the Indian economy around $75 billion each year, with medical expenses and loss of income driving many accident survivors into poverty.
Agence France-Presse