The NIA teams made extensive searches at Sanver, a suburban town in Indore and detained Dinesh Devra.
Devra of Chandrawatiganj area of Sanver was detained after interrogation, Sanver police station in-charge U P S Chouhan told PTI.
On Monday, NIA had arrested one Balveer Singh from the Shipra police station area in connection with the Samjhauta Express and Malegaon blasts, as well as the murder of former RSS activist Sunil Joshi on January 14.