Police said the two offices are located near each other and the agitators protesting against the passage of three bills in the assembly first set fire to the divisional employment exchange at Head Quarter Veng this afternoon.
When they attempted to torch the sub-divisional officer's office, personnel of India Reserve Battalion under commanding officer N Manimohan Singh rushed to the area and tried to turn them away, police said.
A scuffle ensued between the two sides during which the IRB were totally outnumbered by the agitators.
Both buildings were reduced to ashes, the police said adding there was no report of any injury in the incident so far.
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Earlier in the day, one more person succumbed to his injuries sustained in the police firing taking the toll to eight.
A Manipur government official said the toll was given out as eight yesterday and included a motorcyclist, who had died in a road accident.
The motorcyclist had skidded on the road at Churachandpur town while trying to avoid boulders strewn on the road by the agitators and had sustained head injuries on August 31. He was rushed to a private hospital where he succumbed to injuries, the official said.
A public meeting was held during the day in the town by Joint Action Committee amidst tight security.
Central paramilitary forces like Assam Rifles, CRPF, BSF had been deployed to control the situation.
Police said the JAC, formed yesterday by communities living in Churachandpur, stuck to its decision not to claim the bodies of those killed in the agitation till their demand for withdrawal of the three bills was met by the government.