A drone has been used to locate two elephants that survived a fall down a waterfall in Khao Yai National Park, a veterinarian said on Sunday.

Chananya Kanchanasakha, a veterinarian of the National Parks, Wildlife and Plant Conservation Department, said a drone was flown over the area near Haew Narok waterfall in the national park where eight elephants were found on Saturday morning. Six of them drowned and two survived.

Chananya confirmed the number of dead elephants was at six. As of 8pm Thai time, an operation to remove the carcasses was yet to be successful.

Park officials are tracking the footprints of the two surviving elephants believed to return to the forests.