FILE PHOTO: New York State Attorney General Letitia James speaks at a news conference to announce the filing of a federal lawsuit in partnership with at least 10 U.S. state attorneys general to stop a proposed $26 billion merger of mobile carriers Sprint and T-Mobile in New York, U.S., June 11, 2019. REUTERS/Mike Segar

NEW YORK (Reuters) - New York's attorney general on Tuesday said her office will begin an immediate investigation into Capital One Financial Corp's COF.N data breach, which the bank said involved the access of personal information belonging to about 100 million people in the United States.

Letitia James, the attorney general said it has become “far too commonplace” for financial institutions to be susceptible to hacks, and her office will work to ensure that victims in New York obtain relief. Capital One’s breach was announced on Monday.

James was involved in last week's settlement providing restitution to roughly 147 million consumers affected by a 2017 breach at credit reporting company Equifax Inc EFX.N.