MUMBAI: Indian stock markets witnessed a major sell-off on Friday as the Sensex plummeted 1,048.16 points to close at 82,626.76. The Nifty fell 336.10 points, ending at 25,471.10. A sharp decline in IT stocks combined with weak global cues triggered the slump. Almost all sectors ended in the red, with Midcap and Smallcap indices also dropping by 1.5%.