The incident comes in the final days of the Biden presidency and as officials work to root out China-tied hackers from U.S. telecommunications systems.

The "threat actor" was able to access the workstations via a compromised third-party cybersecurity service provider called BeyondTrust, the department said.

By Raphael Satter and AJ Vicens WASHINGTON (Reuters) -Chinese state-sponsored hackers breached the U.S. Treasury Department's computer security guardrails this month and stole documents in what Treasury called a "major incident,