Claiming that there was a link between the accused in the two cases, the CBI on Friday took the custody of Bangera and Digvekar from the Karnataka SIT.
So far, six people, including Hindu Janajagruti Samiti member and ENT surgeon Virendrasinh Tawde, Sachin Andure and Sharad Kalaskar, have been arrested by the CBI in connection with the killing of Dabholkar.
The conspiracy was hatched by Virendra Sinh Tawde (already arrested), Kalaskar and others, CBI lawyer said.
The film and theatre personality was among the most vocal critics of hardline Hindutva whose security was beefed up following the killing of Lankesh in September last year.