The case was registered on the basis of media reports about the incident which occurred yesterday, police said.
Radhakrishnan had gone to the spot to talk and settle the stir by local protesters against removal of side slabs on a culvert on a key road in the area by Forest Department, causing hardship to local residents, mostly tribals and settlers.
The agitation was led by George, who was elected to the Lok Sabha as an LDF-backed independent.
Besides George, 25 unidentified persons had been listed as accused in the FIR lodged at the Adimali police station, police said.