Kalia Perumal, brother of former telecom minister A Raja, was on Wednesday questioned by the CBI in connection with the 2G spectrum case.
Mr. Perumal had been questioned on Tuesday by the Directorate of Enforcement on certain aspects relating to the scam.
Official sources said Mr. Perumal was asked by the CBI about some documents and information regarding his business enterprises.
Mr. Perumal, a businessman by profession, is under the scanner of the investigating agencies as they are trying to find out if his firm has acted as fronts for the former telecom minister.
Mr. Perumal has been questioned by the CBI earlier too and the sources said he is likely to be questioned again in coming days.
Mr. Raja is currently in Tihar Jail after a CBI court remanded him in judicial custody.
