New Delhi, May 12 -- The Central Bureau of Investigation (CBI) formed a special investigation team (SIT) led by a deputy inspector general (DIG) rank officer to investigate a larger conspiracy and inter-state ramifications in the murder of Chandranath Rath, aide to West Bengal chief minister Suvendu Adhikari, people familiar with the development said on Tuesday.

The federal agency already registered a case after taking over the first information report (FIR) from West Bengal police.

Officials said that the SIT, led by DIG Pankaj Kumar Singh is currently in the process of taking over from local police and examining all cases documents so far, besides taking the custody of three men-- Mayank Raj Mishra and Vicky Maurya (both from Bihar) a...