Massachusetts attorney general Maura Healey expects a multi-state probe to be launched into the breach at Experian that compromised data of 15 million people who sought to open accounts with T-Mobile US.
"We have contacted both companies to review the circumstances and anticipate working with attorneys general across the country on this matter," Healey said in a statement.
A spokeswoman for Healey declined to elaborate on plans for a potential multi-state investigation into the cyber attack that was disclosed last week.
Illinois and Connecticut are also looking the breach, according to representatives for the attorneys general in those two states.
Experian spokespeople did not respond to requests for comment into the response from US states on the breach.
In April 2014, several states announced a joint probe into a breach of social security numbers involving Court Ventures, a firm that Experian acquired.
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