The smoke from the fire was first detected by a cleaner at around 7.30 am from the data processing room of the North Treasury at the 3rd Secretariat Building, homeguards spokesperson Paul H Shylla said.
He alerted two home guards personnel posted on the ground floor.
The home guards personnel broke open the lock to enter the room and doused the flames in less than 30 minutes, Shylla said.
A wooden partition and two computer tables and chairs were reduced to ashes, he said.
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