OUR STAFF REPORTER LAHORE Two National Accountability Bureau directors on Monday refused to attend a meeting called by the NAB s Punjab chapter former director general whose tenure came to an end on April 20 and was not given any extension in this regard, The Nation has learnt. The directors refused to coordinate with the former DG Rana Zahid Mahmood when he attended the office as NAB DG , sources said and added that he (Rana Zahid) could no more act as NAB director general because his tenure was finished about five days ago. The sources also revealed that he was pursuing the famous case of Canal Motor Scam in favour of his relative, a police official allegedly involved in the scam.