They said the fire was noticed in Ekaloothu and shenbaganur areas and suspected some anti-social elements to be behind it. The entire forest was facing a heat wave and dry leaves and bamboo could have caught fire due to friction.
In Ekaloothu area 50 trees had been charred, while a lot of smoke was visible in Kodaikanal area.
Officials expressed confidence of controlling the fire, saying fire service personnel were fully prepared to tackle it.