They said the Kochhars were called to the agency headquarters and arrested after a brief questioning session.
The CBI has alleged that they were evasive in their responses and did not cooperate in the investigation.
The Kochhars will be produced before a special CBI court on Saturday.
They are likely to be kept in separate lockups on the ground floor of the 11-storeyed agency headquarters after their medical examination.
Sources said that agency is likely to move at a swift pace to file the first charge sheet in the case in which the Kochhars could be named along with Venugopal Dhoot of Videocon Group.
The CBI had named the Kochhars and Dhoot, along with companies
The CBI had alleged that
It was also alleged that as a part of the quid pro quo, Dhoot made an investment of Rs 64 crore in Nupower Renewables through Supreme Energy Pvt Ltd (SEPL) and transferred SEPL to Pinnacle Energy Trust managed by Deepak Kochhar through a circuitous route between 2010 and 2012, the FIR has alleged.
It is alleged that during the tenure of Chanda Kochhar at ICICI Bank, six loans worth Rs 1,875 crore were cleared for the Videocon Group and its associated companies during 2009-11. In two cases, she was on the sanctioning committees.
Chanda Kochhar was on the sanctioning committee deciding two loans -- Rs 300 crore to Videocon International Electronics Limited (VIEL) on August 26, 2009, and Rs 750 crore to Videocon Industries Limited on October 31, 2011 -- the FIR has alleged.
The loans were issued in alleged violation of laid-down policies and regulations of the bank, it alleged.
Most of these loans became non-performing assets, causing a loss of Rs 1,730 crore to the bank, it alleged.
A day after the Rs 300-crore loan was disbursed by ICICI Bank to VIEL, Dhoot transferred Rs 64 crore to Nupower Renewables, managed by Deepak Kochhar, on September 8, 2009, it alleged.
The transfer of Rs 64 crore was made from Videocon Industries Ltd through SEPL.
"This was the first major capital received by NRL (Nupower Renewables) to acquire the first power plant. Chanda Kochhar got illegal gratification, undue benefit through her husband from VIL/VN Dhoot for sanctioning Rs 300 crore loan to VIEL," the FIR alleged.
On May 1, 2009, Chanda Kochhar took over the charge of ICICI Bank as Managing Director and CEO.
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