A state-sponsored attacker from China hacked the U.S. Treasury Department, gaining access to government employee workstations and classified documents, the Biden administration said Monday, according to the New York Times.

The announcement comes after revelations in recent months that China had deeply penetrated US telecommunications systems, gaining access to the phone conversations and text messages of US officials and others.

On Dec. 8, a software services company, BeyondTrust, notified the Treasury Department that a hacker had obtained a security key that allowed him to remotely access certain Treasury workstations and documents on them, the department said in a letter which informs the legislators of the episode.

The Treasury Department said it had worked with the FBI, the intelligence community and other investigators to determine the impact of the breach. The hacked service had been taken offline and there is no evidence that the Chinese state actor still has access to Treasury information, the ministry said.

In a statement, a Treasury spokesman said the ministry took threats against its systems and the data they hold very seriously and would continue to work with the private sector and government agencies to protect the financial system from hacking. .

The Treasury Department did not say when the incident took place, but said it would reveal more details in an upcoming supplemental report to Congress.

Recent reports of a separate breach of US telecommunications systems by a Chinese hacker group nicknamed Salt Typhoon have raised concerns about the vulnerability of US systems. Microsoft’s cybersecurity team discovered this hacking over the summer, which gave China access to conversations held by Donald J. Trump and JD Vance, among other Americans.