Former Telecom Minister A Raja has been arrested by the CBI in the 2G Spectrum case. CBI sources said former Telecom Secretary Siddartha Behura and his former personal secretary R K Chandolia have also been arrested. Earlier today Raja was questioned by the investigating agency for the fourth time in connection with the case. CBI sources said that he was also asked about his conversations with corporate lobbyist Nira Radia and the reasons of advancing the cut-off date of allocation of the spectrum in 2007. The Supreme Court had also asked CBI and Enforcement Directorate to submit status reports on their investigations into the 2G spectrum case to it by February 10 when the case will come up for further hearing.