Thirty three year old Sandip Shinde was picked up from the organisation's headquarters at Ponda in Goa.
Goa police assisted its counterparts to conduct a thorough search at the ashram and quiz the Saunstha member.
Shinde, who was earlier questioned by the NIA in the 2009-Margao blast case in Goa, was taken to Ponda police station after which he was escorted to Pune for further questioning.
The rationalist was shot dead by unidentified motorcycle born assailants this month while he was on a morning walk on the Omkareshwar temple bridge in Pune.
--IBNS (Posted on 29-08-2013)