The Sensex at the Bombay Stock Exchange plunged 345 points, or 1.7 percent, to a two-month low of 19,585, today, on a slow-down in foreign fund inflows, and subdued European markets. The Nifty at the National Stock Exchange declined 109 points, or 1.8 percent, to 5,890.Stock markets in Japan, China, Hong Kong, Singapore, and South Korea ended mixed.