The bus was carrying 20 soldiers on a narrow mountainous stretch to their nearby camp on Friday after a training exercise in Lower Siang district of Arunachal Pradesh state, said police officer S. Singpho.
A helicopter evacuated the injured to a nearby hospital, he said. The region is nearly 600 kilometers (375 miles) north of Gauhati, the capital of Assam state.
It's the second mudslide-related accident in the state within days. On June 24, five workers were buried alive when a wall of a building under construction collapsed on them.
Mudlslides are common in the June-September monsoon season in India.
