Cybersecurity officials are still sizing up how much truth, if any, there is in a purported hacker group's claim that it stole data on hundreds of millions of U.S. card accounts.

The group, calling itself Anonymous Ukraine, said last week that it has seized information related to 800 million U.S. credit and debit card accounts — including cards said to belong to President Obama and other political heavyweights. The group says it wants to harm the U.S. economy.

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