Hacking group AntiSec has announced 1,000,001 Apple device UDIDs (Unique Device Identifiers) obtained from FBI breach. A laptop used by FBI official was breached and a document containing personal information about Apple users is found. According to their post on
http://pastebin.com/nfVT7b0Z the original document contained 12,000,000 devices, but they have decided that million is enough to release.
It seems that FBI was using Apple products to track citizens and this might be another proof of how faulty the whole system is.
UPDATE: FBI issued a statement in which they say there is no evidence of data being retrieved from the compromised device, nor that such data ever exited on this device.
http://www.encryptedfilestorage.com/fbi-denies-antisec-claims/