The Bombay Stock Exchange benchmark Sensex on Wednesday rose by 104 points in opening trade on sustained buying by foreign funds, tracking firming Asian bourses.

The 30-share index gained 104.09 points, or 0.58 per cent, at 17,790.33 points, a level not seen since February 2008. All the sectoral indices were trading in positive zone with gains up to 0.92 per cent.