The carcasses were found two days ago. A team of forest officials visited the spot and examined the elephant remains, a senior Forest Division official told PTI today.
Only after a probe will it be known how the tuskers died, the official said, adding that the tusks of all the elephants were found removed.
Meanwhile, V K Venkatachalam of Elephant Heritage Task Force said killing of elephants for ivory had been going on in the state since over a year.
"We had earlier brought this matter to the Wildlife Crime Control Bureau, New Delhi, and also to the Chief Wildlife Warden, Kerala," he said.
Following the complaint, a team of officials from the Chennai unit of the bureau had conducted a detailed probe in January this year, he added.