A benchmark index of Indian equities markets, the 30-scrip BSE Sensitive Index (Sensex), on Tuesday tanked further by 346.09 points or 1.32 percent during the afternoon session.The wider 50-scrip Nifty of the National Stock Exchange (NSE) was also trading 112.50 points or 1.41 percent down at 7,858.80 points.The Sensex of the S&P Bombay Stock Exchange (BSE), which opened at 26,127.04 points, was trading at 25,937 points (at 01.09 p.m.) in the afternoon session, down 346.09 points or 1.32 percent from the previous day's close at 26,283.09 points.The Sensex touched a high of 26,141.07 points and a low of 25,913.57 points in the trade so far.Heavy selling pressure was seen in banking, metal, capital goods and realty sectors, while marginal good buying was observed in IT and technology, media and entertainment (TECK) sector.