(Bloomberg) -- The U.S. government’s human resources director resigned Friday, a day after disclosing that hackers stole personal data for more than 22 million people from her agency in one of the worst security breaches in history.

Katherine Archuleta, director of the Office of Personnel Management, stepped down after several lawmakers in both parties complained that she had failed to install appropriate safeguards for the government’s records and did not quickly detect or address the breach.

President Barack Obama, who appointed Archuleta in 2013, accepted the resignation as his administration pledged to step up its cybersecurity efforts and help the 22.1 million people whose data was stolen.

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