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The Democratic National Committee said its computer network was breached by Russian government hackers who gained access to opposition research on presumptive Republican nominee Donald Trump.

DNC chairwoman Debbie Wasserman Schultz called the incident “serious” and said the committee moved quickly to “kick out the intruders and secure our network.” The chairwoman said the DNC reached out to the cyber firm CrowdStrike to help with the hack.

The DNC said financial and personal information does not appear to have been accessed by the hackers.

The Washington Post, who first reported the incident, said some hackers had access to the DNC network for about a year and they were able to read all email and chat traffic.

A spokesman from the Russian Embassy told the Washington Post that he did not have any knowledge of the breach.