Mumbai: Today, the Indian stock markets opened on a bleak note at 14,674.92, and continued to trade imperfectly on worries of US subprime mortgage losses and also because of strong selling pressure observed in the index heavyweights in the morning trades.

The stocks from IT, pharma, cement, telecom, banking and auto took a plunge.

As soon as, the trading session weakened, the benchmark Sensex lost over 509 points and reach below 15,000 mark.

The BSE-30 shares index that closed weak after losing 207.83 points yesterday lost another 509.82 points, or 3.38 per cent at 14,590.33 in the first five minutes of trade.

Similarly, the National Stock Exchange's Nifty dropped 164 points, or 3.07 per cent at 4,239.20. All the BSE-30 index and Nifty-50 stocks were in the red with steep falls.