Police arrested four men including a HSBC Bank customer support executive in Madhapur in connection with duplication and cloning of debit and credit cards on Monday.
Syed Jaber, the key person involved, along with two cashiers, a helper working in petrol bunks, as well a Nigerian identified as "Omorye", who is absconding, allegedly duplicated, cloned and swiped credit and debit cards and illegally made around Rs 10 lakh over the last six months, the police said.
Syed Jaber works at the HSBC Bank call centre as customer support executive and has detailed knowledge about credit and debit cards, had done a course in hacking.
He came in contact with the Nigerian through the Internet and learned many tricks from him, a senior police officer of Central Crime Station's (CCS) detective department said.
The police nabbed all the four men and seized 150 unused credit and debit cards from them which have over Rs 25 lakh in their accounts.