A LexisNexis executive said Wednesday there may have been an earlier breach of consumers’ personal data that was never reported to the public.

The disclosure at a Senate hearing came a day after London-based Reed Elsevier, which owns LexisNexis, revealed that criminals may have breached computer files containing the personal information of 310,000 people since January 2003. That in itself was a tenfold increase over the 32,000 people the company said in March were put at risk. The company said the fraud involved the improper use of IDs and passwords.