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President Barack Obama's cybersecurity adviser said on Thursday that he was concerned about a data breach at health insurer Anthem that has affected up to 80 million people.
"Obviously it's quite concerning that we would have yet another intrusion of this size," Michael Daniel said at a seminar organized by Bloomberg Government.
Read More80million records at risk in insurer hack attack
"It's particularly disturbing especially when it hits that many people," Daniel said, advising affected consumers to change their passwords and monitor their credit scores.
Daniel declined to comment further on the breach, which is under investigation by the FBI.