(Bloomberg) -- The Federal Bureau of Investigation is investigating a hacking attack on the Democratic National Committee that some U.S. lawmakers and cybersecurity experts say may be linked to the Russian government.

"The FBI is investigating a cyber intrusion involving the DNC and are working to determine the nature and scope of the matter," the bureau said in a statement Monday. "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 threat in cyberspace."

Democratic officials and cybersecurity company CrowdStrike Inc. said last month that hackers tied to the Russian government gained access to servers at the DNC. On Friday, three days before the start of the party’s national convention, almost 20,000 e-mails and other documents stolen in the attack were posted online by WikiLeaks, resulting in the ouster of DNC chairwoman Debbie Wasserman Schultz.

The Russian hackers who hit the DNC burrowed much further into the U.S. political system, sweeping in law firms, lobbyists, consultants, foundations and think tanks, according to a person familiar with investigations of the attacks.

Republican presidential nominee Donald Trump ridiculed allegations that Russia leaked DNC e-mails to benefit his campaign. “The new joke in town is that Russia leaked the disastrous DNC e-mails, which should never have been written (stupid), because Putin likes me,” Trump said on Twitter Monday.

Clinton campaign manager Robby Mook was careful in addressing questions about the role of Russians hackers in the breach. “I want to let the experts speak on this,” he said Monday, adding that analysts have concluded the hack was “perpetrated by Russian state actors.” He said that “considering the calculated release,” experts have inferred that “it was the Russians who perpetrated this leak for the purpose of helping Donald Trump and hurting Hillary Clinton.”

Mark Stroh, a spokesman for the White House National Security Council, referred questions on the hack to the FBI and declined to speculate on the timing of the administration assigning blame for the hack.

The Russian government reiterated a previous statement denying involvement in the hack, spokesman Dmitry Peskov told reporters Monday.

--With assistance from Stepan Kravchenko Angela Greiling Keane Toluse Olorunnipa and Michael Riley

Register or login for access to this item and much more

All Information Management content is archived after seven days.

Community members receive:
  • All recent and archived articles
  • Conference offers and updates
  • A full menu of enewsletter options
  • Web seminars, white papers, ebooks

Don't have an account? Register for Free Unlimited Access