Target was alert to early warning signs before the security data breach and declined to act, according to a new report.
Target says its ongoing forensic investigation shows the holiday shopping data breach affected 70 million more customers than initially estimated.
JPMorgan Chase is limiting the debit transactions of customers who used their cards at Target during a recent security breach.
Anger is mounting at Target - with one lawsuit already filed - after the company revealed Thursday that the credit and debit card information of up to 40 million customers may have been exposed.
Target is issuing a warning to its customers after a massive data breach exposed credit and debit cards. It's unclear how up to 40 million customers' names, card numbers, expiration dates, and three-digit security codes were breached.