UNITED NEWS INTERNATIONAL (UNI) — At least nine hikers have died during a forest fire in the Indian state of Tamil Nadu.

On Monday, March 12, the Tamil Nadu government ordered a probe into the deaths of the hikers killed by a forest fire in the Kurangani Hills on Sunday.

The hills are a popular tourist and hiking destination in Theni District.

CNN reports the deceased hikers were four men, four women and a girl.

AFP news agency noted 27 people were rescued with 18 injured.

Some of the victims suffered from serious burns on their bodies and were treated at local hospitals.

Multiple hiking groups were in the area during the fire including a group organized by Chennai Trekking Club.

The rescue efforts were coordinated by India’s National disaster management and the Indian Air Force.

At this time, the cause of the fire is unknown.