Arrested debit and credit card forgery gang members told detectives that information technology experts of different banks helped them in the crime.
One of the arrestees, Md Selim, the ringleader, himself set up around 900 ATM booths of different banks while working as an IT expert at Amra Technologies and other IT firms. With the help of other IT experts of different banks, he stole customers' information, said Mashiur Rahman, additional deputy commissioner of Dhaka Metropolitan Police.
Detectives on Tuesday night arrested four members of the group. They are Selim, 42, Arif Hossain Khan, 38, manager of Advanced Data Network, Manzurul Haque, 30, and Asadul Islam, 30. Manzurul and Asadul are IT experts of Mutual Trust Bank.
A Dhaka Court placed them on a three-day remand on Wednesday.
Mashiur said Selim, who received a state award in 2001 as an emerging scientist, took up card forgery as his profession after he was terminated from his job.
Most ATM booths are equipped with modern machines. But Brac Bank still has some old machines at some booths from where the fraudsters can easily steal information using false interfaces, said Mashiur, quoting the arrestees.