The Democratic National Committee (DNC) rebuffed requests by federal agents to inspect computer servers that had been breached last year during the presidential campaign, forcing them to rely on third-party cyber security data to investigate the hack, the Federal Bureau of Investigation (FBI) said.
U.S. Democrats were in turmoil on Sunday, with their party chair abruptly announcing her resignation on the eve of the national convention to officially nominate Hillary Clinton as its presidential candidate.
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