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Dec. 16: The company begins notifying payment processors and card networks.
Dec. 18: Target discovers and removes malware on 25 additional registers.
Dec. 18: Computer security blogger Brian Krebs posts a story saying Target is confronting a security breach.
Dec. 19: Target confirms that credit and debit card information of 40 million customers had been exposed.
Jan 10: Target announces that personal information of up to 70 million customers also was exposed.
Jan. 13: CEO Gregg Steinhafel apologizes to customers for the data breach in a televised interview with CNBC.
Feb. 4: Target CFO John Mulligan briefs the Senate Judiciary Committee on the data breach.
Feb. 5: Mulligan testifies before a House subcommittee.
Feb. 7: Fazio Mechanical Services, a Pennsylvania-based heating and air conditioning contractor hired by Target, is identified as the conduit through which cyberthieves breached Target’s payment system.
Feb. 26: Target reports 2013 financial results, including $61 million spent in the fourth quarter on costs related to the cybertheft.
March 5: Target announces the resignation of Beth Jacob as senior vice president and chief information officer.
March 13: Bloomberg Businessweek publishes an article that says Target IT security missed warning signs from its malware detection software.
March 26: Target CFO John Mulligan again testifies on Capitol Hill, this time to answer allegations that the company missed opportunities to stop the cyberthieves.
Sources: Senate Committee on Commerce, Science, and Transportation; Bloomberg Businessweek; Brian Krebs; Target Corp., Star Tribune