Lalu Prasad Yadav and Rabri Devi/ File Pic

The Central Bureau of Investigation on Monday registered a charge sheet against two companies and 12 people, including former railway minister Lalu Prasad, his wife Rabri Devi and son Tejashwi Yadav. The charge sheet alleges that they are involved in irregularities in grant of an operational contract of two IRCTC hotels to a private firm.