Sensex fell over 800 points in early trade on Monday, while Nifty slipped below the 23,200 mark. Shares of IndiGo, Tata Steel, M&M and Eternal fell more than 2% each, while Reliance, HCL and ITC declined 1.12%, 1.15% and 1.16%, respectively. Meanwhile, the Indian rupee opened at 95.32 against the US dollar.