Minor explosions are still taking place at the Salawa Army Camp in Kosgama, Avissawella, Hiru correspondent at the scene said.
Army Media Spokesperson Brigadier Jayanath Jayaweera said even though the fire was contained explosions can take place from time to time.
Security personnel have entered the storage where the fire took place.
Army has warned people to refrain from touching any objects lying around in the area as there is a risk of explosions.
In case such materials are found contact the army headquarters be contacted via hot line 011 3 81 86 09 or 011 2 43 42 51.