JPMorgan Chase and other banks are restricting debit card use by consumers potentially exposed to the retailer's recent data breach, according to reports.

Chase notified consumers who used debit cards during the breach that it's limiting cash withdrawals to $100 per day and purchases totaling $300 per day, according to Reuters and other news agencies.

The limit affects about 2 million accounts, or less than 10% of Chase debit card accounts, and does not apply to credit cards, the wire service reported. The Target data breach exposed about 40 million credit and debit cards between Nov. 27 and Dec. 15.

Patricia Wexler, a Chase spokesperson, confirmed the details of the reports and referred questions to a customer service page on Chase's website.

Chase branches are available for consumers who wish to transact beyond the temporary restrictions, the site says.  The bank also opened about 1,700 branches on Sunday to help customers, particularly those affected by the breach, Wexler says.

Other banks, including Citigroup and Bank of America, are placing restrictions on card use in the wake of the Target breach, Reuters reports.  Citi and Bank of America did not immediately respond to requests for comment.

PNC says "most" of its consumers were not affected by the breach in a statement posted to its website and emailed to customers.

"Banks are putting various precautions in place and we can’t speak to the specifics on what they are doing for their customers," says Molly Snyder, a Target spokesperson, in an email.

Target has deepened fraud monitoring protocols on its Red Card accounts, is working to provide a year of fraud monitoring for affected consumers; and is providing information on what steps consumers can take, including obtaining a free credit report and changing PINs, Snyder says.

The affected cards are believed to be offered for sale on underground sites, though many banks are loath to limit or halt card use during the holiday shopping season.

The Target breach has been a source of concern for the broader retail industry, since Target's deep experience with payment cards and technology suggests it should have been a difficult target for fraudsters.

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