Giving up all its initial gains, the Sensex at the Bombay Stock Exchange stood 145 points, or 0.8 percent in negative territory, at 18,102 in very volatile afternoon trade a short while ago. Earlier, in morning trade, however, the Sensex had opened with a solid gain of 322 points, or 1.8 per cent, at 18,568, led by a rally in banking stocks, after the steps taken by the Reserve Bank, overnight, to ease liquidity. The Sensex had lost over 1,100 points in the previous three trading sessions.Stock markets in China, Singapore, Hong Kong and South Korea had declined between 0.4 percent and 0.9 percent, today. And ahead of the release of the crucial minutes of the US Federal Reserve's July meeting, Wall Street's Dow Jones Industrial Average had ended 0.1 per cent lower in yesterday's trade.