A hack on Democratic National Committee servers resulted in last week's embarrassing leak of emails that revealed how party leaders sought to undermine Clinton's Democratic White House rival Bernie Sanders.
Clinton's campaign has blamed Russia for hacking the emails, which were made public by anti-secrecy website WikiLeaks.
The Kremlin dismissed the allegations as absurd, but President Barack Obama has refused to rule out the possibility that Russia is trying to sway the presidential election in favor of Republican Donald Trump.
"Our campaign computer system has been under review by outside cyber security experts," campaign spokesman Nick Merrill said in a statement.
"To date, they have found no evidence that our internal systems have been compromised."
Meanwhile, the Democratic Congressional Campaign Committee (DCCC) said yesterday it was the target of a "cyber security incident."
"The investigation is ongoing. Based on the information we have to date, we've been advised by investigators that this is similar to other recent incidents, including the DNC breach," national press secretary Meredith Kelly said in a statement.
The Federal Bureau of Investigation said it was working to determine the "accuracy, nature and scope" of reports of cyber intrusions "involving multiple political entities."
The FBI "takes seriously any allegations of intrusions, and we will continue to hold accountable those who pose a threat in cyberspace," the agency said.
WikiLeaks founder Julian Assange indicated more Clinton campaign leaks were forthcoming.
"We have more material related to the Hillary Clinton campaign," he told CNN on Friday. "Those are extremely interesting. We will see what will come of them in due course."
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