The Sensex at the Bombay Stock Exchange surged 324 points, or 1.8 percent, to close at a nearly one-week high of 18,876, today. The surge was on account of fresh buying by funds after the rupee appreciated and also following better-than-expected current account deficit numbers. The Nifty at the National Stock Exchange spurted 94 points, or 1.7 percent, to 5,682.Stock markets in Japan, Hong Kong, South Korea and Singapore gained between 0.4 percent and 3 percent.