The CBI on Saturday arrested a present and an ex-MD of a PSU in connection with the ongoing probe in an alleged corruption case against Delhi Chief Minister's former Principal Secretary, Rajendra Kumar. Sources said they have been arrested from Delhi.<br/><br/>On Friday, the agency had conducted searches at six locations including Delhi, NOIDA and Agra in the case. Kumar is presently in the CBI custody. <br/><br/>Kumar and four others were arrested by the CBI on Monday for allegedly showing undue favours to a private company in award of government contracts worth over 50 crore rupees. The investigating agency had registered a case in this regard in December last year.