The Sensex at the Bombay Stock Exchange surged 346 points, or 2 percent, to 17,404, today, after the government issued a clarification on Participatory Notes, and as European markets rose. The Nifty at the National Stock Exchange climbed 117 points, or 2.3 percent, to 5,296. Stock markets in Japan, China, Hong Kong, Singapore and South Korea ended mixed.