The CBI said that hawala transactions worth Rs 2 crore have been detected so far in the raids.
It has been detected during the operation that several public officials from the MHA, NGO representatives and middleman exchanged money to facilitate the foreign donations in violation of FCRA, 2010, they said.
So far, the agency has apprehended around six persons including MHA officials and NGO representatives in connection with the case, they said.
The coordinated operation over the alleged FCRA breaches is under way at multiple locations including in Delhi, Chennai, Hyderabad, Coimbatore, Mysore and some places in Rajasthan, they said.
The agency officials said that the countrywide raids were conducted based on the inputs provided by the Union home ministry.
(With inputs from PTI)