The Sensex declined by over 67 points in the opening trade today, as investors and funds booked profits at prevailing higher levels. The 30-share barometer, which had gained over 519 points in the last three trading sessions, fell by 67 points to 20,408 within the first few minutes of trade. Refinery, realty, IT and banking sectors which were under pressure, dragged down the bellwether Sensex in the early session. Similarly, the wide-based National stock Exchange, Nifty index too slipped by 41 points to 6,118 points.