The director of a school in northern India has been killed by a mob after two of the facility's students were found dead.

The mob attacked the boarding school's director after the bodies of two boys aged 10 and 11 were found in a nearby pond, Nalanda district police Superintendent Siddhartha Kumar Jain said.

The students had disappeared a day earlier from the school grounds, and villagers accused school staff of killing them and dumping them in the pond. Post-mortem examinations later showed the boys had drowned.

Local TV stations broadcast video of the man being beaten with sticks and writhing on the ground as other people watched and stomped on his chest, stomach and limbs.

He died of his injuries on Sunday night.

When police arrived, the mob allegedly pelted them with stones and injured six officers. Police suspended an officer for failing to stop the attack in Nirpur village, 55 miles south-east of Patna, the capital of Bihar state.