WASHINGTON -- The FBI on Tuesday disputed a computer hacker group's claim that it stole personal identification data on millions of Apple device owners from an FBI agent's laptop.

FBI officials said the bureau never asked for and never possessed the database that the group, which calls itself AntiSec, is posting on a website.

The group has released a link to a database of more than 1 million unique identification numbers for Apple devices, which could include iPhones and iPads. AntiSec said the data is just a piece of the more than 12 million unique identification numbers and personal information on the device owners that it got from a laptop used by an FBI agent.

The FBI denied that it ever had that information. But officials there said they could not verify the validity of the data that AntiSec released. Federal officials also warned that computer users should be careful when clicking on such links because they sometimes may contain malware that can infect computers.

Joe Stewart, a security researcher with Atlanta-based Dell SecureWorks, said, however, that he tested the link and did not find any connection to malware.