Target Corp. said the Department of Justice is investigating the security breach at the retailer that’s being called the second largest such incident in U.S. history.

The DOJ declined to comment on whether it’s investigating Target, the nation’s second largest discounter.

Target also said that it’s teaming up with the U.S. Secret Service in its own investigation. Target said the Secret Service has asked the company not to share many of the details of the probe.

Additionally, Target said that it held a conference call with the state attorneys general on Monday.

The investigations and the call come after Target said earlier this week that data connected to about 40 million credit and debit card accounts was stolen that began over the Thanksgiving weekend.

(AP)