The Federal Reserve has confirmed that it's been hacked, following a claim from Anonymous that it's harvested the details of 4,000 US bank executives.
The Fed hasn't confirmed that its breach is the same one announced by Anonymous, but says that personal information was involved.
"The Federal Reserve system is aware that information was obtained by exploiting a temporary vulnerability in a website vendor product," a spokeswoman told Reuters. "Exposure was fixed shortly after discovery and is no longer an issue. This incident did not affect critical operations of the Federal Reserve system."
It says it's contacted everybody affected.
Anonymous says it posted the details on the .gov website of the Alabama Criminal Justice Information Center - from where they've now been taken down - as part of its new Operation Last Resort campaign.
It's demanding the reform of US computer crime laws following the recent suicide of internet activist Aaron Swartz, and last week attacked the website of the US Sentencing Commission.
"Now we have your attention America: Anonymous's Superbowl Commercial 4k banker d0x via the FED," it posted on its Twitter feed over the weekend. "Yes we posted over 4000 U.S. bank executive credentials."
It's released usernames, real world names, mobile phone numbers and hashed passwords for the 4,000 people involved - some of them presidents and chief operating officers - who work at a variety of banks and credit unions.