The stock went down by 3.23 per cent to Rs 872.20 in morning trade on the BSE.
At the NSE, it fell by 3.4 per cent to Rs 871.30.
The scrip was the biggest loser among the bluechips on both Sensex and Nifty.
Cracking down on a suspected case of corporate espionage, the Delhi police had yesterday arrested two Oil Ministry officials, one RIL staffer and two other middlemen, for allegedly leaking classified government documents to energy companies for money.
Reliance Industries said it has been brought to its notice that one of its staffer has been detained by law enforcement authorities.