U.S. Treasury Secretary Janet Yellen met virtually on Monday with Chinese Vice Premier He Lifeng and raised concerns about "malicious cyber activity" carried out by Chinese state-sponsored actors, the Treasury Department said in a statement.

US Treasury Secretary Janet Yellen told China’s Vice Premier He Lifeng of her “serious concern” regarding “malicious cyber activity” a week after the US said Chinese state-sponsored hackers had breached the Treasury Department’s computer networks.

In a virtual meeting with Chinese Vice Premier He Lifeng, Yellen “expressed serious concern about malicious cyber activity by PRC state-sponsored actors,” the Treasury said in a statement, referring to the People’s Republic of China. Yellen also flagged the impact of such issues on the US-China relationship, the statement said.

Threat actors entered Treasury Department systems through BeyondTrust. The breach may be related to the Salt Typhoon attacks.