No casualties had been reported so far in the fire broke out at the ammunition depot of the Salawa Army Camp at Kosgama, Hospital sources said.
They said no injured were admitted to the Awissawella Hospital, Colombo South Teaching Hospital or to the National Hospital-Colombo so far.
However, ambulances of the Awissawella Hospital had been deployed to the location already, they said.
Meanwhile, heavy traffic was reported along the main road and people were being immediately evacuated from the area.
The Health Ministry said all the hospitals around the location of the fire stand ready to face any crisis situation.