Police said that a landslide occurred in landslide two days before the accident and could stop the mountain roads due to rain.
At least 48 people died after the accident which saw a submerged bus in a Himalaya mountain and a 700ft deep shaft, officials said.
Police said rescue operations are being carried out after the accident in Northern India's Puri Garhwal district.
Traveling from Bhairon to Ramnagar, the 28-seat bus has doubled the number of passengers, officials say
At least seven people are believed to have been critically injured.
Police officer Jagat Ram Joshi said, "The people packed like sardines".
Uttarakhand Chief Minister, Trivedi Rawat said that the bus was lying in depth and 700 feet (213 meters) in the date palm. Senior police officer Sanjay Gunjal said that 20 bodies have been pulled from the debris, but due to bad weather the rescue work was hampered.
The reason for the accident is still not known, but Mr. Gunjal says that the road can surround the bus to stop the road. He said: "It's raining since morning (area). Two days ago there was a landslide in that area." The residents were the first scene to help in hunting, he said.
More than 110,000 people are killed every year on India's deadly road. Most crashes are blamed on missing driving, poor maintenance roads, and aging vehicles.