Falling for the second straight day today, the Sensex at the Bombay Stock Exchange plunged 341 points, or 1.7 percent, to 19,923, in the afternoon trade, a short while ago. The Nifty at the National Stock Exchange dropped 113 points, or 1.9 percent, to 5,900. In other Asian stock markets, key indices in China, Hong Kong, South Korea and Singapore had been trading mixed, in intra-day trade. Stock market in Japan were closed for a holiday.