The Sensex at the Bombay Stock Exchange plunged 285 points, or 1.5 percent, to close at a two-week low of 19,008, even as the Reserve Bank announced its credit policy review, and as European markets fell, today. During the session, the Sensex had dropped below the 19,000 level. The Nifty at the National Stock Exchange fell 89 points, or 1.5 percent, to 5,746.But stock markets in Japan, China, Singapore and South Korea gained between 0.4 percent and 2 percent.