Chinese state-sponsored hackers breached the Treasury Department's computer security guardrails this month, according to a letter to lawmakers that Treasury officials provided to Reuters.

“We have repeatedly stated our position on such groundless accusations that lack evidence,” Mao Ning said at a daily briefing. “China consistently opposes all forms of hacking, and we are even more opposed to the dissemination of false information against China for political purposes.”

Chinese state-sponsored hackers infiltrated the U.S. Treasury Department by exploiting a vulnerability in third-party software provider BeyondTrust, granting them remote access to several workstations and unclassified documents.