An accountability court (AC) on Saturday sought reply from the National Accountability Bureau (NAB) on a petition filed by Executive Builders Manager Operation Usman for unfreezing his accounts in connection with the Paragon Housing Society scam. The NAB has accused him of transferring millions of rupees into accounts of Pakistan Muslim League-Nawaz (PML-N) leader and Member of the National Assembly (MNA) Khawaja Saad Rafique and his brother Salman Rafique, who are under judicial remand till March 19 in the same case.