The Uttarakhand Roadways bus, carrying about 40 passengers, fell into a 100-ft deep gorge at Dhyari, nearly 65 kms from Almora, killing 15 persons on the spot, Kumaon DIG Pushkar Sailal said.
Twenty-five persons, who sustained injuries in the accident, have been rushed to hospital, he said, adding the accident occurred around 1 PM.
The bodies are still being extricated from the bus and rescue operations are on, he said.
Causes of the accident are being probed, he said.
Pradesh Congress Chief Kishore Upadhyay also expressed grief at the loss of lives in the accident.