The Federal Bureau of Investigation says it's investigating a hack into the emails of the Democratic National Committee, which then surfaced on the website WikiLeaks. The FBI said it was investigating the nature and scope of the incident. "A compromise of this nature is something we take very seriously, and the FBI will continue to investigate and hold accountable those who pose a thread in cyberspace," the bureau said. The hack, which showed DNC officials critical of the presidential campaign of Sen. Bernie Sanders, has been alleged to have come from Russia, though WikiLeaks has refused to identify the source of the material.