Reopening for trade after a two-day holiday, the BSE benchmark Sensex rose over 310 points within minutes of the opening bell on Friday on continued buying by funds, ignoring rising inflation and weak Asian cues. The 30-share index of the Bombay Stock Exchange, which gained nearly 828 points in the previous two sessions, moved up further by 313 points, or 1.89 per cent, to 16,989 in opening trade today. In a similar fashion, the broad-based National Stock Exchange Nifty index surged by 112.70 points, or 0.51 per cent, to 5,113. Meanwhile, Hong Kong's Hang Seng Index was trading 0.16 per cent lower and Japan's Nikkei Index was down by 0.89 per cent in morning trade today. The US Dow Jones Industrial Average ended 1.03 per cent lower in the previous session.