The Income Tax Department today conducted a nationwide raid on more than 50 premises of various companies to probe alleged financial irregularities in Commonwealth Games contracts. Official sources said, over 50 premises spread across Delhi, Bangalore, Mumbai, Jamshedpur, Kolkata and National Capital Region were the focus of the raiding teams comprising over 300 officials. Our Correspondent reports, a large number of documents pertaining to contracts awarded in connection with the Games have been seized.The Income Tax department on October 19th had carried out similar searches on four major consortia, including those related to BJP member Sudhanshu Mittal.