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.

The Treasury Department says Chinese hackers remotely accessed several employee workstations and unclassified documents after compromising a third-party software service provider.

The Biden administration revealed Monday that China-backed hackers infiltrated the U.S. Treasury Department earlier this month in what officials are calling a "major cybersecurity incident."