Searches were conducted at the offices of M/s Aerospace Technology Lab and M/s Embedded Computing Laboratory, the Central agency said.
Documents seized during the searches suggested that these firms acted as shell companies and earned commission for it, it said.
These companies were the "links for diversion of funds" by fraudsters, DIG V Chandrasekar of CBI said in a release.
CBI had come across several shell companies during the investigation of bank fraud and other cases, he said.
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