Security was breached on more than 700 Citibank credit cards held by Mainers, state officials said Thursday.

The breach resulted in unauthorized access to personal information, including email addresses and account numbers, on those customer accounts, Maine Attorney General William Schneider said in a news release.

The breach did not result in access to customers’ Social Security numbers, dates of birth, credit card expiration dates or credit card security codes, Schneider said.

The bank began notifying customers of the breach earlier this month by letter and/or through its website during the log-in process. The bank doesn’t plan to notify affected account holders by phone or email, Schneider said. The bank expects to reissue credit cards to customers who could be affected by the breach, he said.

“This breach is a direct threat to the confidentiality and security of the private information of Citi’s Maine credit card customers,” Schneider said. “Credit card users should review their account activity frequently and be aware that legitimate communication from Citi will not occur by a phone call or random email.”

If information on a customer’s account has been compromised, that doesn’t mean that customer’s identity has been stolen, Schneider said. Identity theft occurs only when an unauthorized person fraudulently uses that information to secure money, goods or services in another person’s name, he said.

A customer’s credit report can be protected by placing a security freeze or “file freeze” on it. With a freeze in place, the credit reporting agency cannot release a credit report without the individual’s authorization. To place a security freeze on your credit file, you must send a written request to the three major credit reporting agencies, Schneider said. The security freeze is provided at no charge to consumers who have been victims of identity theft.