SP, Police control, Harkumar Debbarma said, when the IPFT activists set fire on the bikes it engulfed the area and the party office caught fire from the burning bikes yesterday. Four CPIM activists were also injured.
Police recovered 15 burnt bikes from the scene.
Meanwhile, CPI-M state party Secretary Bijan Dhar claimed that seven activists of CPI-M were injured in the incident and 25-27 bikes were burnt down by the IPFT activists.
Dhar said, the IPFT in league with opposition BJP were trying to subvert the atmosphere of peace in the state.