Commonwealth Organising Committee Chief Suresh Kalamdi was today questioned by the CBI in connection with alleged financial irregularities in the conduct of the sports event. Kalmadi reached the CBI office around 10 this morning and his questioning began about half an hour later. Official sources said, the questioning is about alleged irregularities in the Queen Baton's Relay held in London last year besides certain contracts awarded to various firms totaling several hundred crores. The agency had raided his Pune and Delhi premises on December 24 during which several documents were seized. The sleuths have grilled Kalmadi's three key aides in connection with the scam. Besides Kalmadi, the CBI had also conducted raids at the residence of OC Secretary General Lalit Bhanot, R K Sacheti, who is Joint Director General of the OC, and Sangeeta Welingkar, member of the Games Image and Look Group. The agency has so far filed three FIRs in connection with the alleged financial irregularities. While one case is related to a 107-crore rupees deal struck with a Swiss score keeping firm, the CBI had registered two other FIRs in connection with the contract given to AM Films for the Baton Relay ceremonies by the OC in London.