The central bureau of investigation (CBI) today arrested Rajendra Kumar the Principal Secretary to the Delhi Chief Minister Arvind Kejriwal.He has been arrested for his alleged involvement in a corruption case. He has been accused of favouring private firms by allotting government contracts without following the proper tendering process resulting in massive loss to the government's exchequer Kumar also has been booked under charges of criminal conspiracy and corruption for allegedly favouring a private company in five contracts worth Rs 9.5 crore between 2007 and 2014. Four others were also arrested along with Mr Kumar, but the Central Bureau of Investigation, which is investigating the case, say the officer is the kingpin of the scam. The senior IAS officer was a close confidante of Kejriwal and was one of the Aam Aadmi Party’s first bureaucratic appointments during its 49-day stint last year. He held authority over several important departments, including transport and education, before taking over as the CM’s secretary.