LulzSec hacker Ryan Cleary has admitted launching distributed denial-of-service attacks against the websites of the Serious Organised Crime Agency and the CIA.
Cleary, along with fellow LulzSec member Jake Davies, 19, pleaded guilty to a series of attacks on the websites of organisations including News International and Sony, the Guardian reported on Monday.
The 20-year-old Cleary also admitted hacking into Air Force Agency computers at the Pentagon.
The pair pleaded guilty to taking part in distributed denial-of-service (DDoS) attacks against organisations including 20th Century Fox and security company HBGary. The attacks were carried out with members of the Anonymous, LulzSec, and Internet Feds hacking groups.
However, both Cleary and Davies denied further charges of posting unlawfully obtained data to the Pirate Bay and Pastebin.
Cleary and Davies appeared at Southwark Crown Court alongside Ryan Ackroyd, from Mexborough, Doncaster, and a 17-year-old boy, who are accused of taking part in Anonymous and LulzSec hacking activities. Ackroyd and the youth pleaded not guilty.
The four will stand trial on the remaining charges on 8 April, 2013.