The Sensex at the Bombay Stock Exchange, which rose by over 106 points in early trade today, stood at 100 points in the positive territory at 18,389 in late morning deals, when reports last came in. After gaining 135 points in the previous session, the 30-share index rose further by 106 points, or 0.58 percent, to 18,396 points in the first few minutes of trade today. The rise was attributed to sustained buying by funds and retail investors, amid a firming trend in Asian markets. The wide-based Nifty of the National Stock Exchange was trading 36 points up at 5,600.