Department of Justice inspector general Michael Horowitz confirmed on Thursday that the FBI used undercover sources as part of its response to the Jan. 6 Capitol riot, a revelation that lends clarity to an aspect of the event that has long been a source of speculation.

Horowitz said in a long-awaited 84-page report that the FBI used 26 sources, most of whom were unpaid. Some of them were embedded among rioters in restricted areas, and four also entered the Capitol with them, Horowitz said. He noted, however, that the FBI did not authorize any of those undercover, known as “confidential human sources,” to enter the Capitol or otherwise break the law.

The DOJ, through U.S. Attorney Matthew Graves’s office in Washington, D.C., has charged more than 1,500 people in connection to the riot in the past four years. A majority of them have faced minor trespassing violations, while hundreds of others have faced more serious charges, such as assaulting police officers or destroying property.

The defendants were largely supporters of President-elect Donald Trump and participated in the riot as part of a protest of the 2020 election results. Since the incident, a faction of Trump’s supporters have spread the theory that law enforcement organized the riot or abetted participants, but Horowitz did not reach this conclusion.

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This story is developing and will be updated.