The informant’s name was not published in the records, though he was associated with a Midwest chapter of the far-right group the Proud Boys, according to the newspaper.
Based on an account of the informant’s activities described in the records, the source described meeting up with men from other Proud Boys chapters at 10 a.m. at the Washington Monument and finally entering the Capitol.
The informant entered after debating whether to do so, the Times reported. He left through a window after police told him that someone had been shot — likely Trump supporter Ashli Babbitt, the newspaper stressed.
The source has since rejected that the Proud Boys planned to use violence on Jan. 6 but rather were overwhelmed by a herd mentality. He has also denied that the group planned to attack the Capitol in discussions, the Times reported.
In a statement to The Hill, an FBI spokesperson said the agency's "mission is to protect the American people and uphold the Constitution of the United States, and intelligence gathering is essential to those efforts."
"While the FBI’s standard practice is not to discuss its sources and methods, it is important to understand that sources provide valuable information regarding criminal activity and national security matters," the statement said.
More than 600 people have been arrested in connection with the deadly attack, according to the Justice Department, and more than 50 have pleaded guilty.
The Times noted that 15 members of the Proud Boys have been accused of conspiracy in four separate cases.
Reuters reported in early August that the FBI has discovered little evidence to indicate that the attack was largely planned.
While groups such as the Proud Boys and the Oath Keepers were set on entering the Capitol, officials told Reuters that there seemed to be no coordinated plans about what they would do once they broke into the building.
But there’s also no indication the informant was anywhere near any sort of leadership position in the organization, which in turn puts questions about how well the FBI is tracking far-right groups.
Prosecutors have so far filed conspiracy charges against 15 Proud Boys members, who are among the more than 600 people facing charges in connection to the Capitol riot.