The Sensex at the Bombay Stock Exchange has lost 133 points, or 0.7 percent, to 19,460, a short while ago, as selling pressure intensified in afternoon trade, after the announcement of the Reserve Bank's monetary policy review. Earlier in the morning, however, the Sensex had opened with a gain of 27 points, or 0.1 per cent, at 19,621, on selective buying by investors, ahead of the RBI's monetary policy review.Stock markets in Japan, China, Hong Kong, Singapore, South Korea, Indonesia and Taiwan had gained between 0.2 percent and 1.2 percent, today. But the US Dow Jones Industrial Average had ended 0.2 per cent lower in yesterday's session.