A key Indian stock market index logged its steepest intra-day fall on Monday and lost over 2,000 points, as bears tightened their grip on the bourses amid worries over US recession, before staging a 700-point rally towards the closing bell. As trading came to a close, the 30-share sensitive index (Sensex) of the Bombay Stock Exchange (BSE) had made a marginal recovery, but was still down 1,408.35 points, or 7.41 per cent, in what was the steepest closing fall since May 2004.