Continuing its rising streak for the third straight session, the BSE benchmark index Sensex rose by another 84 points in early trade today on sustained capital inflows.The 30-share index, which had gained almost 275 points in the previous two sessions, rose by 84.59 points to 18,513.20 points. The wide-based Nifty of the National Stock Exchange moved up by 16.75 points to 5,623.90.