US Democrats said that they had been targeted by yet another cyber attack, while Hillary Clinton's campaign confirmed that an analytics program it used was breached in an earlier intrusion. A hack on Democratic National Committee servers resulted in last week's embarrassing leak of emails that had revealed how party leaders sought to undermine Clinton's Democratic White House rival Bernie Sanders.

"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."

The Democratic Congressional Campaign Committee (DCCC) said that 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 that more Clinton campaign leaks were forthcoming. "We have more material related to the Hillary Clinton campaign," he told CNN. "Those are extremely interesting. We will see what will come of them in due course."

"The DNC and the RNC have been Swiss cheese in terms of their security," he said. Assange defended the leak, saying it is "true information." "If we don't understand what our institution's doing, we have no hope to reform them whatsoever," he said.

By Premji