WASHINGTON, United States — A former employee in the CIA’s cyber-spying operation was indicted Monday on charges of leaking hacking tools to WikiLeaks in one of the most damaging of the agency’s breaches in recent years.

Joshua Schulte, 29, was charged with leaking unspecified information on the Central Intelligence Agency’s intelligence-gathering capabilities to a group identified only as “Organization-1,” which then released the information on the internet.

While the indictment gave no other details, in earlier filings Schulte’s lawyer indicated the investigation involved the leak to WikiLeaks of the “Vault 7” collection of hacking tools, malware, viruses, trojans, and “zero day” exploits which comprised the CIA’s most valuable tools for tapping into adversaries’ computers.

WikiLeaks began releasing the 8,761 documents from Vault 7 in March 2017, embarrassing the agency and providing professional and amateur hackers around the world with the same tools that US spies used.

“The source wishes to initiate a public debate about the security, creation, use, proliferation and democratic control of cyberweapons,” WikiLeaks said at the time.

It was arguably the worst of a series of leaks of some of the most closely held secrets of the US intelligence community, alarming the government’s top security officials.