The injured were admitted to the medical college hospital here.
The CCTV visuals showed noisy scenes in the council meeting and the mayor leaving the hall and falling down the stairs while moving towards his chamber in the first floor.
Prasanth was injured in the head and also suffered bruises in the body.
His condition was stable, a Medical college hospital release said.
Councillors Raziya Beegam and Sindu both from CPI-M and a aide of the mayor B Mohan are the others suffered injury and they are under treatment at the hospital, the release said.