Home Depot is working with banks and law enforcement agencies to investigate a potential theft of its customers' credit and debit card information.

"At this point, I can confirm that we're looking into some unusual activity and we are working with our banking partners and law enforcement to investigate," said Paula Drake, a Home Depot spokeswoman, in an emailed statement Tuesday. "Protecting our customers' information is something we take extremely seriously, and we are aggressively gathering facts at this point while working to protect customers."

The investigation was first reported Tuesday by Krebs on Security, a blog written by former Washington Post reporter Brian Krebs.

Citing multiple unnamed sources, Krebs reported that several banks have found evidence naming Home Depot as the source of stolen credit card data that went on sale Tuesday in an underground market.

The incident may have been carried out by the same Russian and Ukrainian groups responsible for recent data breaches at major retailers, including Target, Sally Beauty and P.F. Chang's, according to the report.

News of the investigation comes just three months after Home Depot acknowledged that a former employee improperly accessed more than 30,000 customer accounts.