The incident took place near Dharampenta village under Kistaram police station limits when a team of security personnel was patrolling in the region to ensure security to an under-construction culvert, Sukma Superintendent of Police D Shravan told PTI.
The culvert is being constructed on Gulab nullah near Dharampenta, located around 500 km from the state capital Raipur.
While the security personnel were cordoning off the spot, constable Dinesh Baghel, belonging to CAF's sixth battalion, inadvertently stepped over a pressure landmine triggering the explosion injuring him critically, the SP said.