New Delhi - Indian markets extended their losses Friday as the benchmark Sensex stock index fell by nearly 4 per cent by midafternoon after opening on a strong note.

The 30-share sensitive index was quoted at 10,175.1, down 406.39 points, or 3.84 per cent.

Besides information technology firms Satyam Computer Services Ltd and Tata Consultancy Services Ltd, all the other of its 28 stocks were in the red.

Similarly, the broader 50-share Nifty index fell by 128.2 points, or 3.92 per cent, to 3141.1.

Foreign funds, which have been the main drivers of India's stock market upswing in recent years, have been net sellers this week, pulling out more than a billion dollars.

Foreign investors also sold stocks worth nearly 2 billion dollars in October and 11 billion dollars since January, the latest government data showed. (dpa)