Prime Minister Syed Yousuf Raza Gilani has said that Chairman National Accountability Bureau (NAB) has tendered his resignation and has been asked to hold the office till new appointee. Gilani was talking to media after inauguration of 220 megawatt thermal power station in Karachi on Friday. Prime Minister Gilani said that the water dispute between Sindh and Punjab will be resolved soon, for which efforts were underway.