Chief Minister K Palaniswami said 10 persons--seven women and three men-- were killed in the fire at Kurangani Hill ranges in Western Ghats and expressed grief over the deaths.
While seven of the victims were from Chennai, others were from Erode district, he said in a statement.
"I was anguished to know that 10 persons were killed in the forest fire," the Chief Minister said.
While directing a probe into the incident, the Chief Minister said action should be initiated against those who arranged for the trek without Forest department's permission.
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The district administration and health department officials had been instructed to ensure best medical treatment to those admitted to local hospitals, he said.
He also prayed for their swift recovery.
Palaniswami said soon after he came to know of the fire on Sunday, he directed steps for their safe rescue. Deputy O Panneerselvam and the others oversaw the operations,he said.
While state rescue agencies, including Fire department rescued 26 stranded persons, the Centre also deployed defence helicopters and commando forces during the operations,he said.
Palaniswami earlier in the day said the trekkers caught in the fire did not have permission for the expedition.
"Without permission, they embarked on a trekking expedition. Trekkers should climb hills only after taking the government's nod," he had said in his native Salem district.
The Chief Minister also warned that stern action would be taken in future against trekkers who undertake such expeditions without state's permission.
A 36-member team -- 24 people from Chennai and 12 from Tiruppur and Erode districts -- had embarked on the trekking expedition and reached Kurangani hills on March 10.
The team included 25 women and three children, according to Theni District Collector Mariam Pallavi Baldev.
Three of them had returned to the plains without going ahead further.
Baldev said the trekkers after staying at an estate in Kozhukumalai overnight, started their return journey to the plains yesterday morning when they heard of the sudden forest fire and got separated while attempting to find a safe way.
The hills are in the Western Ghats near Bodinayakanur, about 40 km from Theni.