"The carcass has injury marks, caused by spears, in the neck," he told PTI.
Asked when the big cat was killed, Sinha said it could be after 10 AM today, because "till that time, the forest personnel were aware of its location".
On why the tiger could not be captured over the last month-and-a-half, he said, "We had tried out best. We had put cages in different areas of the forest. We had sent tranquilising teams, but could not capture it."
Sinha added that the National Tiger Conservation Authority (NTCA) was informed of the development.
On whether a post-mortem would be conducted of the animal, he said that was the process in such cases.
Reacting sharply to the news, Biswajit Roy Chowdhury, a wildlife expert and the secretary of an NGO, the Nature Environment and Wildlife Society, wondered why the animal could not be captured by the Forest department.
"We had also failed to spread awareness among the people regarding protecting the tiger," he said.
Joydip Kundu of the Society for Heritage and Ecological Researches said, "It is a black day for us. The tiger was brutally killed. The Forest department is doing a good work in the Sunderbans, but here, the tiger could not be saved."
He was also critical of the "hunting festival" of the tribals of the area and said no one should support it in the name of tradition.
"Now it has happened. It is very sad for those who love nature, who love tigers," he added.
(This story has not been edited by Business Standard staff and is auto-generated from a syndicated feed.)