Tor Warns Users It Was Attacked
 

If you are a Tor user, you might want to read this. On July 4 2014 we found a group of relays that we assume were trying to deanonymize users. They appear to have been targeting people who operate or access Tor hidden services. The attack involved modifying Tor protocol headers to do traffic confirmation attacks.

http://www.hardocp.com/news/2014/07/..._was_attacked/