Eight activists of pro-LTTE PDK and MDMK outfits were on Sunday arrested for their involvement in Saturday's attack on a military convoy at nearby Nilambur, police said.
The arrested were produced before a magistrate court in Coimbatore, which remanded them in judicial custody. They were later lodged in the Central jail in Coimbatore, they said.
The accused have been charged under three relevant sections of IPC, including causing damage to public property, police said.
A group of PDK and MDMK had blocked a convoy of 80 military vehicles, carrying training equipment and weapons, from Hyderabad to Maddukkarai regiment near Coimbatore.
The protesters dragged drivers out from four vans and thrown the materials out, suspecting that the arms and ammunitions were meant for Sri Lankan army.
They also deflated the tyres and broke the window screens of the trucks.
Military personnel accompanying the trucks retaliated by hitting the activists with iron rods and wooden poles used for pitching tents. A TV reporter covering the event had sustained minor injuries.
The army personnel left with their vehicles after police intervened.