The BSE benchmark Sensex which fell by over 129 points in opening trade, was trading 160 points in red at 18,154 when reports last came in. The 30-share barometer, which gained 117 points in the previous session, fell by 130 points, or 0.71 per cent, to 18,185 in the first few minutes of trade. In a similar fashion, the wide-based National Stock Exchange Nifty index was trading 50 points in red at 5,467.