A hacker turned FBI informant led cyber attacks on Turkey's government while under US supervision, a new report claims.

Hector Xavier Monsegur – known online as Sabu - agreed to take down key figures from hacking collective Anonymous in return for avoiding a 20-year prison sentence for cyber crimes.

His actions helped to snare eight of the world's top hackers, and disrupt at least 300 cyber attacks.

But a report from technology website The Daily Dot now says that he also led cyber attacks on the Turkish government while under US supervision.

Court documents show how he created an alliance between his own group, AntiSec, and politically motivated Turkish hackers known as RedHack.


Monsegur reportedly acted as the operation's ringleader, and recruited Jeremy Hammond – who was at the top of the FBI's cyber crime most-wanted list.

Chat session records show Monsegur asking Hammond to "pop off" several foreign government websites from a list provided.

Hammond was told that access to any hacked Turkish websites would be provided to RedHack.

On the day Hammond obtained access to more than 10 government servers in Turkey, he was invited to a private chatroom along with a RedHack member.

Once in the room with Monsegur the access to the servers was handed over to key RedHack member RedStar.

Monsegur told him: "We rooted these for you. Get into the boxes and do what you do."

Court documents show that stolen data was stored on a server under the FBI's control.

The FBI insists it acted within the attorney general's guidelines.

Monsegur, who was arrested in 2011, was given a one-year supervision order earlier this year as a result of his co-operation.

Hammond was sentenced to 10 years in prison.