The Federal Board of Revenue (FBR) has directed the "Election Cells" working in each Large Taxpayer Unit (LTU) and Regional Tax Office (RTO) to remain open on April 6-7, ie Saturday & Sunday round the clock to facilitate the process of verification of declaration on nomination papers by the candidates contesting elections. In this regard, the FBR has issued an office order to all LTUs/RTOs here on Friday.