The state-run Syrian Arab News Agency said dozens of "terrorist elements" have been killed as security forces continue to track down and arrest them.

CNN: Syrians defiant as world powers plan talks

Provide advice to governments on how to protect their computer systems and track down and arrest hackers.

CNN: Global panel issues Internet security recommendations

Information gathered during Rivera's arrest led police forces in the US and other countries to track down other members of the Lulzsec group.

BBC: Lulzsec hacker pleads guilty over Sony attack