The FBI is disputing a computer hacking group's claim that they swiped a file containing Apple UDID's from an agent's laptop.
Anti-sec claims it obtained the personal identification information on more than 12 million Apple devices from FBI agent Christopher Stangl.
"During the second week of March 2012, a Dell Vostro notebook, used by Supervisor Special Agent Christopher K. Stangl from FBI Regional Cyber Action Team and New York FBI Office Evidence Response Team was breached," claims the group.
The group said they found a file called "NCFTA_iOS_devices_intel.csv" which contained a list of 12,367,232 Apple iOS devices. The .csv file contained Unique Device Identifiers, user names, names of devices, types of devices zip codes, cell phone numbers and address, according to the group.
The law enforcement agency said they never asked for and never had the database the group has posted on a Web site.
Anti-sec posted 1 million on of the reported UDID's on a file-sharing site on Tuesday. Computer security experts and tech blogs confirmed that the 40-character strings were similar to those used as Apple UDID's. The group did not post any personal information of device owners.
Apple has not responded to repeated requests for comment.
To see if your device's UDID has been leaked, click here.