Extending initial losses, the Sensex at the Bombay Stock Exchange that nosedived by 185 points in late morning trade continue to decline by 221.08 points to 17,698.22 in the afternoon deals after RBI kept rates unchanged in its mid-quarterly review of the monetary policy. All the sectoral indices, led by banking and consumer durables, were trading in the negative zone with losses upto 2.09 per cent.In a similar fashion, the broad-based National Stock Exchange index Nifty dipped below 5,400 points level by losing 75.15 points to 5,388.75 points.