CBI sources said AGM S K Garg and Jainish Dubey, who headed the Foreign Exchange division at BoB's branch in Ashok Vihar here were arrested for criminal conspiracy, cheating and provisions of the Prevention of Corruption Act.
On the other side, Enforcement Directorate arrested four persons, including an HDFC bank employee, in connection with the case.
The Directorate arrested arrested Kamal Kalra, working with the foreign exchange division of HDFC bank, Chandan Bhatia, Gurucharan Singh Dhawan and Sanjay Aggarwal after marathon questioning at its office here.
The sources claimed the agency has prima facie information about their alleged involvement and pecuniary gains in facilitating these transfers which are still being probe.
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Both of the officials were arrested after detailed questioning in connection with the case, they said.
The CBI FIR had alleged that "59 current account holders and unknown bank officials conspired to send overseas remittances, mostly to Hong Kong, of foreign exchange worth approximately Rs 6,000 crore in illegal and irregular manner in violation of established banking norms under the garb of payments towards suspected non-existent imports".
The agency had said these remittances were sent by splitting them into amounts below one lakh USD to avoid automatic detection by software used by banks to alert them about such transactions.
CBI found that an estimated Rs 6,000 crore was transferred through nearly 8,000 transactions done between July, 2014 and July, 2015. While CBI is probing the corruption angle in the funds transfer case, ED is looking at the case to check money laundering and hawala.