The fallout from last December's massive security breach at Target has been contained in the digital sphere and courtrooms -- until now. Denver police are now on the hunt for a man believed to be using credit cards stolen from that breach.

Lakewood police are looking for a man caught on camera at a Target store during one of his shopping sprees. According to police, the suspect has successfully purchased $9,000 in merchandise from Target, Best Buy, 7-Eleven, Walgreens, and other stores in the Denver metro area. Another $15,000 in purchases was denied. The suspect has used 16 stolen credit cards and is believed to have access to as many as 30.

"Capital One advised detectives the credit card numbers being used were some of the many compromised during the breach occurring at Target stores during 2013," Lakewood Police said in a news release. "The suspect appears to have encoded the cards in the name of Steve Locke or Steve S Locke."

"The theory is he probably purchased these credit card numbers online somewhere. If there are a million compromised someone is selling millions at some point," said Lakewood Police spokesman Steve Davis.

Police are urging anyone with information that could lead to the suspect's arrest or whereabouts to call the Lakewood Police Department or Detective Muller at 303-987-7111 or 303-987-7281.

Cyberthieves made off with the personal records of 110 million Americans from Target databases soon after the busy Black Friday shopping spree ended. Of the 110 million stolen records, 40 million are credit cards. The heist is the largest ever of retail data in history. Target admits the investigation is ongoing and that the actual scope of damage may be worse than initially thought.

"Our investigation of the matter is ongoing and it is possible that we will identify additional information that was accessed or stolen, which could materially worsen the losses and reputational damage we have experienced," Target said in its 10-K report filed with the Securities and Exchange Commission in March.

The breach has cost Target customers, and the No. 3 U.S. retailer is under even more fire now after it was revealed security teams had issued warnings to Target concerning the breach that the retailer disregarded.

"The best technology in the world is useless unless there's good management," Senator Richard Blumenthal, a Democrat from Connecticut, said at a Senate hearing in March. "And here, to be quite blunt, there were multiple warnings from the company's anti-intrusion software; they were missed by management."

Chairman of the Senate Commerce Committee Senator John D. Rockefeller IV, Democrat of West Virginia, added that the Target breach "must be a clarion call to businesses, both large and small, that it's time to invest in some changes."

"We know this has shaken their confidence, and we intend to earn it back," Mr. Mulligan said of Target shoppers at the same Senate hearing. "Like you, we are asking hard questions about whether we could have taken different actions before the breach was discovered that would have resulted in different outcomes."

Lawsuits against Target are now being consolidated in Minnesota, where the retailer has its headquarters.