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Target CEO resigns after data breach

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This morning, Target released a statement announcing that its CEO, Gregg Steinhafel, is leaving the company. The news comes five months after hackers stole 40 million credit card numbers from the store.

In the statement, Steinhafel said he is "personally responsible" for the data breach. Target's chief financial officer, John Mulligan, will serve as interim president and CEO following Steinhafel's exit.

"We are grateful to him for his tireless leadership and will always consider him a member of the Target family," the company's board of directors said.

Last month, Target acknowledged that company officials were alerted to the data breach but chose to ignore the suspicious activity.