A three-session falling streak drove the Bombay Stock Exchange benchmark Sensex below 15K level and NSE's Nifty breached 4,500 level in early trade on Thursday on heavy selling by funds in index-related stocks.
The 30-share index, which was continuing its downward march for the past two sessions, lost another 186.66 points in the first five minutes of trading at 14,906.46.
Similarly, the National Stock Exchange benchmark Nifty dropped by 49.35 points at 4,479.70.
Stock brokers said reports of weakening trend in global markets mainly dampened the trading sentiments on the domestic bourses.
Major stocks which dragged the Sensex down were Reliance Industries, Reliance Infra, Rcom, ONGC, BHEL, Larsen and Toubro, HDFC Bank, ICICI Bank, Ranbaxy Laboratories, NTPC, Maruti Suzuki, ITC Ltd and Grasim Industries.