The incident occurred on Tuesday morning when the polling party was returning from the polling center to Mandsaur district headquarters.

Mandsaur was one of the eight Lok Sabha seats where voting took place in the fourth phase of the Lok Sabha elections on Monday.

Police said the private bus collided with a truck on the Muwasra-Mandsau highway. A home guard died on the spot and those injured in the collision were taken to a nearby hospital.

Police said that the condition of three of them is critical.