More details have emerged regarding the breaching of Treasury Department security protocols by Chinese hackers that the agency first revealed Monday in a letter to Congress.

The department’s Office of Foreign Assets Control, which administers economic sanctions against countries and groups of individuals; the Office of Financial Research; and the office of Treasury Secretary Janet Yellen were targeted, The Washington Post reported Wednesday, citing unnamed U.S. officials who spoke on the condition of anonymity because of the matter’s sensitivity.

A top area of interest for China’s Communist government, current and former officials said, would be Chinese entities that the U.S. government might be considering for financial sanctions, the Post reported. The full impact of the breach is still being assessed. The documents accessed were unclassified, and there is no evidence the hacker still has access to Treasury systems, the department said.

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