Indian equity indices ended on a weak note with Nifty below 24,900 on August 22. At close, the Sensex was down 693.86 points or 0.85 percent at 81,306.85, and the Nifty was down 213.65 points or 0.85 percent at 24,870.10. About 1693 shares advanced, 2208 shares declined, and 143 shares unchanged.