The department is awaiting results from two more labs.
On November 21, a female tiger was found dead at Seemarkuli Odai area near Aachakarai in the Singara range of forests in the Mudumalai Tiger Reserve (MTR) - buffer zone - in the Nilgiris.
As per the protocol of the National Tiger Conservation Authority (NTCA), a search was conducted by the forest field staff around the spot where the carcass of the tiger was found.
Two male tiger cubs were secured by the field staff from a bush in that area.
After postmortem, the preliminary report revealed that there were no physical injuries.