The National Accountability Bureau (NAB) on Friday arrested former water and power secretary Shahid Rafi in the rental power projects corruption case.According to NAB sources, Rafi was arrested in a raid on his residence in the federal capital, while the NAB team also seized important documents from his house.The former federal secretary was shifted to the NAB Rawalpindi office after arrest. He is expected to be presented before an accountability court on Saturday (today) where the NAB will seek his physical remand. The anti-graft watchdog is investigating the former federal secretary for alleged corruption in awarding the contract for a rental power project to a private company. In February, the NAB executive board had rejected Rafi’s request to transfer his corruption reference to Islamabad from Quetta.Meanwhile, the NAB also apprehended Karachi Development Authority (KDA) Director Jamil Baloch on charges of land grabbing in the port city, a private TV channel reported. Baloch was reportedly involved in ‘China cutting’, illegal constructions, fake NOCs and other irregularities in the KDA, besides encroachment on 60 acres of land in Malir riverbed area. On April 10, the NAB had filed a fourth reference against KDA former director Nasir Abbas and others in an accountability court in a case pertaining to illegal allotment of 14 plots in Gulistan-e-Jauhar area.