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“Anonymous” accused the companies of trying to stifle WikiLeaks and rallied an army of online supporters to flood their servers with traffic, periodically blocking access to their sites for hours at a time.

And in February, an Internet forum run by “Anonymous” directed participants to attack the websites of the Egyptian Ministry of Information and the ruling National Democratic Party.

In a Twitter post, the group claimed credit for taking down the ministry’s website and said the group was motivated by a desire to support Egyptian pro-democracy protesters.

— Jorge Sainz in Madrid contributed to this report.