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.

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.

“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.”