One more person has been arrested in connection with the online fraud case in which hackers siphoned off more than Rs 25 lakh from a businessman’s account in Tiruchirappalli district of Tamil Nadu.

Crime Branch—CID wing of Tamil Nadu police have approached CBI and Interpol seeking details of users connected to specific Internet service providers (ISPs) of Nigeria, Canada, Israel, Poland and Britain in the case.

B.S. Sainath Reddy, working as an Assistant Vice-President in a multinational bank in Hyderabad, was arrested on March 4. Three persons were arrested earlier in Chennai and Bangalore and the dragnet has been spread for four more persons, a CB-CID release said.

In his complaint, S. Salahudeen, the businessman, had said Rs. 26.55 lakh was fraudulently transferred from his account without his knowledge.

Possibility of identity theft of his online transaction details like user ID through phishing mail or planting key logger software were ruled out, the release said.

The Cyber Crime team scrutinised the server log of victim’s bank pertaining to the transaction and found that the hacker had used computer systems connected to network belonging to ISPs of Nigeria, Canada, Israel, Poland and Britain to siphon off the sum during a particular period of time last year.

“With regard to foreign ISPs, CBI, Interpol assistance has been sought to get the user details for the Internet connection availed by the hacker,” the release said.