Nine ATM (automated teller machine) kiosks of a nationalised bank across the city, which neither had CCTV cameras nor security guards, were used by the five-member gang arrested in connection with cloning bank cards.
This was revealed during investigations by Central Crime Branch into the case, in which five persons, including two Sri Lankan nationals, have been arrested.
Following this, Commissioner of Police J. K. Tripathy on Monday urged the public to change the personal identification number (PIN) of their bank cards.
According to CCB sources, the data pertaining to more than 780 credit/debit cards were illegally copied using slim skimmers at the nine ATMs. Some of the information was also sold overseas, police said.
The ATMs of the bank targeted are in Nagendra Nagar, Velachery; Royapettah High Road, Mylapore; R.K.Mutt Road, Mandaveli; Poonamallee High Road, Arumbakkam; Pulla Avenue, Shenoy Nagar; Postal Colony Main Road, West Mambalam; Balfour Road, Kilpauk; Gandhi Mandapam Main Road, Kotturpuram; and Anna Salai, Saidapet.