An alleged member of the LulzSec hacking group who prosecutors say targeted the Fox and PBS television networks and Sony's film and TV studio has been indicted in Los Angeles on federal charges, federal authorities said on Wednesday.

Ryan Cleary, 20, who is already jailed in the United Kingdom where he faces prosecution over similar charges, is accused of joining other members of LulzSec in harnessing compromised computers, known as a "botnet," to steal confidential information, deface websites or attack servers. He was indicted on Tuesday.

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