CBI raided a dozen premises across National Capital Region on Thursday in the alleged scam in Commonwealth Games overlays contracts. The Agency also raided an office under the Union Sports Ministry, besides registering a fourth FIR naming for the second time a top Games official V K Verma. The searches that began early Thursday morning were conducted a day after CBI questioned CWG Organising Committee(OC) chief Suresh Kalmadi for about nine hours. Official sources said the office of the International Sports Division under the Ministry of Youth Affairs and Sports and premises of Nussli India and Comfort Net consortium and Pico Deepali were among those searched. Pico's Indian arm, Deepali Designs is stated to be owned by a relative of senior BJP leader Sudhanshu Mittal. The sources said the CBI raids were focused on four companies, which had acted as the Indian arm for an identical number of international firms. The contracts were bagged by consortium of foreign and Indian firms. A large number of documents including in digital format, have been seized from various premises in today's searches. The overlays contacts with a value of 600 crore rupees are also under the scanner of the Income Tax Department and the Enforcement Directorate. Overlays works included supply of tents, marquees, prefabricated units, portable toilets, containers, security fences, furniture, public display LED boards, floor finishes, material handling equipment, gensets, cabling, UPS, air-conditioners, lighting, civil construction, athletic exercise equipment and grandstands.The CBI had earlier registered three FIRs for alleged corruption in projects and events in the run up to the sporting extravaganza. Two of these cases were in connection with alleged irregularities in the Queen's baton relay.