The Central Bureau of Investigation is likely to question Commonwealth Games Organising Committee Chief Suresh Kalmadi later in the day. According to CBI sources, he had informed the investigating agency that he would appear before it after 3rd January. Earlier, he was served a notice for appearing before the CBI. The premier investigating agency in the country had recovered some crucial documents after raids at Kalmadi's residences and offices in Delhi, Mumbai and Pune. Kalmadi's questioning follows the interrogation of his key aides Lalit Bhanot and Manoj Bhore.