(Bloomberg) – Hackers tied to the Russian government gained access to servers at the Democratic National Committee, the party confirmed Tuesday.

The hackers secured the party's full database of opposition research on presumptive Republican presidential nominee Donald Trump, according to The Washington Post, which first reported the hack.

"The security of our system is critical to our operation and to the confidence of the campaigns and state parties we work with," said DNC Chair Debbie Wasserman Schultz, a Florida representative. She said the party "treated this like the serious incident it is" and hired a cyber-security firm. That firm, CrowdStrike, identified as the culprit a pair of sophisticated hacking groups known as "Cozy Bear" and "Fancy Bear," which it said are closely tied to Russian intelligence services.

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