Benchmark indices Sensex and Nifty declined for a second day in a row on Friday due to selling in IT and banking shares amid foreign fund outflows and weak trends in the US markets. The 30-share BSE Sensex fell by 106.62 points or 0.16 per cent to settle at 66,160.20. During the day, it declined by 388.17 points or 0.58 per cent to a low of 65,878.65.