The raids resulted in busting of a "major racket of cash generation" by leading corporate houses in the infrastructure sector through bogus contracts and bills, it said.
Hawala denotes illegal transaction of funds by skirting the legal banking channels.
"Funds meant for public infrastructure projects were siphoned off through entry operators, lobbyists and hawala dealers," it said.
The Board, the policy-making body for the I-T department, however, did not identify the entities raided.
The companies involved in siphoning of funds are mostly located in the national capital region and Mumbai, it said.
One such company was earlier searched by I-T sleuths in April this year, the statement said.
"The projects involved in bogus billing are major infrastructure and EWS (economically weaker section) projects located in south India."
"Evidence of cash payment of more than Rs 150 crore to a prominent person in Andhra Pradesh has also been unearthed during the search," the CBDT
"Unexplained cash of Rs 4.19 crore and jewellery (worth) in excess of Rs 3.2 crore was also seized during the search operation," it said.
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