Home Depot said it is investigating “some unusual activity” on its networks and working with “banking partners and law enforcement,” after security blogger Brian Krebs named the company as a common thread connecting a trove of stolen credit card accounts that have appeared in underground forums.  Krebs reported on Tuesday that “multiple banks” see evidence that Home Depot stores are the source of a “massive new batch” of stolen credit and debit cards that went on sale this morning in underground “carding” forums. The breach is believed to have affected Home Depot stores throughout North America – around 2,500 stores in total. The company has held off from confirming a breach, so far. And as of early Wednesday, Home Depot’s home page made no mention of the incident. In a statement to Reuters, spokesperson Paula Drake said that the company is holding off pending an internal investigation, and is working with law enforcement. […]