The Sensex at the Bombay Stock Exchange shot up 467 points, or 2.3 percent, to close at 20,883, amid positive Asian and European markets, today. The Nifty at the National Stock Exchange surged 144 points, or 2.4 percent, to 6,189.Stock markets in China, Hong Kong, Singapore and South Korea climbed between 0.2 percent and 1.1 percent.