Treasury says hackers accessed “certain unclassified documents” in a “major” breach, but experts believe the attack’s impacts could prove to be more significant as new details emerge.

Hackers connected to China's government successfully breached several Treasury Department workstations and accessed unclassified documents, according to a letter to Congress on Monday. Why it matters: The U.

Chinese state-sponsored hackers broke into the Treasury Department and stole documents from its workstations, the federal agency told lawmakers.