ISLAMABAD - The National Accountability Bureau has planned to arrest former prime minister Raja Pervaiz Asharf in 11 corruption cases on return of NAB Chairman Qamar Zaman Chudhary to the country from his vacation, The Nation has learnt. The NAB had approved six references, three inquiries and two investigations against former PM Pervaiz Ashraf, former finance minister Shaukat Tareen, former secretary Shahid Rafi, ex-MD PPIB Fayyaz Elahi and ex-Pepco MD Tahir Basharat Cheema. Sources in the NAB told The Nation that warrants for Raja Pervaiz Ashraf were on the table of the NAB chairman, but the action had been delayed due to the absence of the NAB chief. He left the country on August 11 on vacation during which he was also attending conferences in Vienna and Malaysia, they added.