LAHORE: The National Accountability Bureau (NAB) Lahore office on Wednesday summoned Fawad Hasan Fawad, principal secretary to Prime Minister Shahid Khaqan Abbasi in the Ashiana Housing Scheme case. NAB has summoned Fawad for an appearance before the probing unit on April 11 for failing to submit replies to the NAB questionnaire. On March 29, Fawad Hassan Fawad appeared before NAB as a witness to record statements in Ashiana Iqbal housing scandal. He was also summoned for an appearance on February 14, but he failed to present himself before the committee.