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MasterCard was not immediately available to comment. The website did not appear to be available online.

Web
activists calling themselves Anonymous threatened earlier this week to
launch denial of service attacks against businesses such as online
payment firm PayPal that had blocked Wikileaks. It is described attempts
to censor Wikileaks as part of the first global infowar.

WikiLeaks
founder Julian Assange is now in custody in Britain, facing extradition
to Sweden for questioning over sex charges, which he denies. Some of
his supporters say the charges are politically motivated against him.

(Reporting by Peter Apps; editing by Mark Heinrich.)

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