Major security breaches of several major U.S. law firms may have actually been perpetrated by state-sponsored Chinese hackers, Fortune reports.

Hackers reportedly launched cyber attacks against some of the country’s most prestigious law firms last summer. Targeted firms include: Cravath Swaine & Moore LLP, Weil Gotshal & Manges LLP, Cleary Gottlieb, Mayer Brown, Latham & Watkins, Covington & Burling, and Davis Polk & Wardell.

Some of the targeted firms represent Wall Street banks and Fortune 500 companies and have access to sensitive corporate information.

Not all of the attacks were successful, but the hackers were still able to steal internal data.

Cravath said that the incident involved a “limited breach” of the firm’s systems and that it was “not aware that any of the information that may have been accessed has been used improperly,” the Wall Street Journal reported in late March, when news of the breaches first broke.

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