Indian banks have asked customers to change their debit card PINs and in some cases blocked access to 3.2 million debit cards. The issue surfaced in September when some banks complained that their customers’ cards were used fraudulently in China and the U.S. while the account holders were in India. Some 640 customers of 19 banks were directly affected, and about 13 million rupees (US$194,800) were defrauded. Initial reports suggested that hackers had accessed the data through malware on automated teller machines.”]