new delhi the cbi has sent letters rogatory to five countries asking for information about former finance minister p chidambarams investments and companies linked to him in connection with its probe into the inx media caseagency sources on friday said the lrs have been sent to the uk switzerland bermuda singapore and mauritius this is being done to seek information about p chidambarams financial assets abroad said the source letter rogatory is an official document written by indian agencies to foreign governments to seek assistance in their probe toi had reported on friday that lrs were sent to at least three countriesthe companies being probed by the agency in this case are located or have bases in these five countries these companies allegedly paid huge sums to the chidambarams and were later granted fipb approvalssources also said chidambaram was questioned briefly on thursday night after he was brought to the cbi headquarters from the court the questioning was done by officers from the economic offences unit and revolved around fipb and fdi approvals to various companiessources said the scope of probe will be widened as information emerges from his custodial interrogation they said the investigators were preparing to confront him with his son karti and corroborate their statements chidambaram will be crossexamined with the evidence on record and the contradictions in his and his sons versionsafter questioning on thursday evening he was served dinner home cooked food was provided to him after inspection and also given a change of clothes before he went off to sleep a medical examination was conducted at the end of the day the source saidchidambaram has been put up in suite 5 located on the ground floor under cctv camera surveillance guarded by two cbi officers he will remain on 247 watch through his custody and the feed will be monitored from a control room on the ground floor