The bodies of five elephants were spotted by drone near the notorious fall known as Haew Narok (Hell's Fall) in Khao Yai National Park, it was announced on Tuesday, following the discovery of six others at the weekend.
The death toll of 11 is the highest number of elephants to die in a single incident in Khao Yai.
There are around 300 wild elephants in the park, which is home to various wild animals, including bears and gibbons, and is a popular destination for tourists.
This photo by Thai News Pix taken on October 5, 2019 shows a dead elephant at the bottom of a waterfall after it fell to its death at Khao Yai National Park in central Thailand.
A frightful story out of Thailand, where a baby elephant apparently slipped over a waterfall and six elephants ultimately died in the ensuing rescue attempt. The young elephant did not survive and officials later found five other drowned elephants on the first level of the large three-tiered waterfall, which has been temporarily closed to visitors. The new victims are thought to have come from the same herd.
He said officials were only able to spot the additional bodies of elephants after the sky had cleared up on Monday.
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"We assume that there were 13 elephants in this herd and two of them survived".
Park officials said the first group of elephants died trying to reach a dead calf.
While Chansrikam's statement offers a possible motive for the elephants' actions, the local media says the reason the animals fell into the strong current is not known.
Two elephants were discovered stuck on the edge of the Haew Narok Waterfall.
Thailand has only about 3,500 to 3,700 wild elephants left nationwide, according to the Department of National Parks, Wildlife and Plant Conservation.