A video of blackbucks scrambling to escape the rising waters at Pulasa Lanka in Vemagiri village surfaced on social media platforms on Saturday evening.
The police recovered the carcass of two blackbucks, a rifle that was used for killing antelopes, and several other items, sources said.
“This lawn is renovated from time to time by the Department of Horticulture,” it said in the response.
The sprawling 30-acre polo ground is under Raj Bhavan’s possession though it is a reserve forest.
The polo ground in Raj Bhavan, one of the last remaining prime habitats for blackbucks in Chennai, is likely to be restored as a grassland after the monsoon season this year.
The blackbuck, an endangered antelope, is listed under Schedule 1 of the Wildlife Protection Act, 1972, enjoying the highest protection.
The officials believed the poaching to be a work of Karnataka hunters as sharp objects were used in the killings.