Four District Reserve Guard personnel made the supreme sacrifice in a Maoist-planted IED blast during a demining operation in Chhattisgarh's Kanker district on Saturday. Inspector Sukhram Vatti and constables Krishna Komra and Sanjay Gadhpale died on the spot, while constable Parmanand Komra succumbed to injuries. The blast took place when the personnel were trying to defuse the IED, police said.