After a Chennai court sentenced the accused to 30 years ' imprisonment in the Anna University sexual assault case, the opposition AIADMK has questioned the DMK government for protecting an unidentified person mentioned in the FIR as 'Sir'.

AIADMK chief and LoP in Tamil Nadu Assembly, E Palaniswamy, alleged that the DMK government rushed the investigation to cover 'sir,' to whom the convict allegedly spoke during the sexual assault.

"Why did the DMK government rush to conclude this case by saying that only Gnanasekaran was guilty? Who saved SIR? Once AIADMK government is formed, all answers will be available," Mr Palaniswami said.

Replying to the allegations, CM MK Stalin said that the court praised the investigation by the police, adding that this had exposed those trying to exploit the tragic event for political gains.

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In a post on X, Stalin said, "During the trial, we have completed the Chennai student's case fairly and expeditiously in just five months, and secured a severe punishment for the culprit, much to the praise of the High Court itself. The women's court has also come forward to praise the police for their excellent performance in this case, as the verdict has been announced. This has put to shame the thoughts of some people with limited intelligence who would seek political gain even from the injustice done to a young woman," he said, taking a swipe at the Opposition.

The Chennai court judge M Rajalakshmi convicted A Gnanasekaran, the sole accused in the Anna University rape case on May 30. On Monday, she sentenced him to life imprisonment for 30 years and fined Rs 90,000.

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The case came to light after the victim lodged a complaint before the All Women Police Station in Kotturpuram on December 23 last year. In her complaint, the victim alleged that Gnanasekaran threatened her when she was with a male friend and then sexually harassed her. Gnanasekaran was later arrested.