An ACB release this evening said that it had arrested Vijay Kasat, sectional engineer, KIDC, and two partners of a private construction firm, Abid Khatri and Zahid Khatri who are brothers.
ACB officials searched the house of Nissar Khatri -- already arrested -- and seized certain documents, it said.
The examination of the documents revealed that he had purchased stamp papers in 2012 on which back-dated contracts of 2006 were fabricated, it said.
Khatri's firm FA Enterprises had paid for the air travel of some officials of Konkan Irrigation Development Corporation, it said.