By Erick Payne, NewsOn6.com

TULSA, Oklahoma -- A credit card company that serves zoos and other cultural centers around the United States, including the Tulsa Zoo, is investigating a security breach of its systems.

Service Systems Associates confirmed Wednesday it was a victim of the data breach, and said it has been working with law enforcement to investigate.

Tulsa Zoo says their data was not included in the possible breach.

The violation originated in the point-of-sale systems located in the gift shops of their clients, SAA said.

"Though the investigation into this attack continues, the malware that caused the breach was identified and removed," the statement continued. "All visitors should feel confident using credit or debit cards anywhere in these facilities."

The company declined to name individual centers affected by the breach, but financial industry sources say at least two dozen cities could have been involved, including three locations in neighboring Texas.