NEW YORK (AP) – The LexisNexis online information service is warning 32,000 people their personal information may have been improperly accessed in a credit card fraud scheme that postal officials say bilked hundreds.

New York-based LexisNexis says in a letter mailed Friday that former customers of the service may have viewed information including names, birth dates and Social Security numbers.

U.S. Postal Service officials have launched a criminal investigation and say 300 people in the databases of LexisNexis and a Santa Fe, N.M., company called Investigative Professionals were victims in the credit card fraud scheme. No suspects have been arrested.