The key Indian equity indices plunged on Tuesday morning tracking weakness in the Asian markets, with the BSE Sensex falling over 600 points. Sensex in early trading was at 30,900.41, lower by 660.81 points or 2.09 percent from the previous close of 31,561.22. It had opened at 31,342.93 and touched an intra-high of 31,342.93 and a low of 30,895.17. The Nifty50 on the National Stock Exchange was trading at 9,054.60 ...