Alleged Naxals shot a worker of the Communist Party of India and triggered a landmine blast, in which two Central Reserve Police Force jawans were injured, in Dantewada district of Chhattisgarh.
All three of them have been admitted to the hospital.
District police authorities told PTI that Naxals attacked Chhotebedma village in Kuakonda station jurisdiction in the district on Tuesday night and shot Mudararam Sodhi, 65, a worker of the CPI and elder brother of a former member of legislative assembly Nandram Sodhi.
Naxals, before shooting Sodhi outside his house, alleged that he was a police informer.
After learning about the incident, CRPF and police personnel visited the village on Wednesday morning and sent Sodhi to the hospital. However, when they were returning, Naxals triggered a landmine blast between Palnar and Kuakonda, authorities said.
Two jawans of CRPF's 111th battalion were seriously injured in the blast, they said.
Senior CPI leader C R Bakshi condemned the attack. He said that according to his information, nearly 30 Naxals had raided the village. They had beaten up some locals before shooting Sodhi.