A Sumatran elephant has been found dead in Indonesia's Aceh province with its tusks cut off, raising suspicion it was killed by poachers.

The carcass of the estimated 25-year-old male elephant was discovered Monday inside a palm oil plantation in Karang Hampa village in West Aceh District.

Genman Sefti Hasibuan of the local Conservation and Natural Resources Agency said the carcass was reported to have been rotten and missing its tusks. Villagers estimated it died four to five days earlier.

It was the first elephant death in Aceh this year, Hasibuan said Tuesday, adding that a team has been sent to the area for investigation.

Fewer than 3,000 Sumatran elephants are left in the wild. Environmentalists say they could be extinct within three decades unless they are protected.