The Indian stock market witnessed strong buying in the early morning today. The BSE Sensex opened upside at 73,005 and touched an intraday high of 73,933, logging an intraday gain of around 900 points. The Sensex was trading at 666 points higher at 73,658. The Nifty also witnessed an uptick, rising 259 points to 22,341 when reports last came in.