ISLAMABAD, May 26: The National Accountability Bureau (NAB) has broadened the scope of investigation into corruption case against Farah Shehzadi (Farah Gogi), ex-prime minister Imran Khan’s wife Bushra Bibi’s friend, to include four more persons in it. In this connection, issuing notices to these four persons namely Muhammad Haris, Muhammad Asif, Waqar and Mazahir Beg on Thursday, the bureau asked them to visit its office on May 30 along with proofs against the former first lady’s friend. The NAB also summoned Farah Gogi’s manager, cashier and banker. -NNI