The Home Depot is the latest major retailer to investigate what looks like a data breach.
The Atlanta-based retailer is looking into the matter and also working with law enforcement and bank investigators.
"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 retailer said in a statement.
Unusual activity spotted by banks tipped off the investigation, according to multiple reports. The retailer pledged to alert customers if it finds out a breach occurred.
If it turns out that Home Depot was hit by hackers, it will join a list of giant retailers that includes Albertson’s, Michaels, SuperValu and – most famously – Target Corp.
Home Depot rival and number-two home improvement player Lowe's also reported a data breach back in May.