Officials were alerted to elephants crying out for help at 3 a.m., the Thai Department of National Parks, Wildlife and Plant Conservation said.
Three hours after officials were on scene a body of a young elephant was found at the base of the waterfall.
They added they heard the sounds of the animals at the Haew Nerok waterfall where they found a three-year-old elephant had drowned on the first tier of the waterfall. Badim Chansrikam, a local officer, told Reuters it seems a bunch of elephants had been crossing a river when a smaller elephant slipped to the water along with the others mounted an unsuccessful rescue, which also places them in danger.
The majority of an elephant herd in Thailand died Saturday trying to rescue a calf in the group. Six of them drowned and two survived. The waterfall has been closed to the public following the incident.
The national park, about 80 miles northeast of Bangkok, has installed fencing along the banks of the 115-foot-wide Samor Poon Creek to try to prevent such accidents. He has also called for "food banks" to be set up around the park so animals do not feel compelled to approach risky areas in times of food scarcity. It was also the site of a similar incident in 1992, when eight elephants fell to their deaths there, BBC reported.
The park said tourists are being barred from the park as officials are monitoring the two elephants that are still alive.
Founder of Wildlife Friends Foundation Thailand Edwin Wiek said the pair may have difficulty surviving, as elephants rely on their large herds for protection and finding food. "There's nothing you can do, it's nature unfortunately".