The report (.pdf) was produced jointly by the Senate Committee on Rules and Administration and the Committee on Homeland Security and Governmental Affairs. It took the two committees five months to issue their findings, which are based on thousands of internal documents and closed-door interviews with senior government officials. Officials interviewed include the then-acting Defense Secretary Christopher Miller and General Mark Milley, Chair of the Joint Chiefs of Staff.

The report details failures in the areas of intelligence collection and exploitation, security preparations and emergency response measures both prior to and during the insurrection. It states that the US Capitol Police was in possession of intelligence from a pro-Trump website, in which militants were urging participants in the president’s “March to Save America” rally to “bring guns”. Armed demonstrators were also urged to surround every exit from the US Capitol Complex, in order to trap members of Congress and their staff inside the building.

However, the intelligence gathered from websites and social media platforms was not utilized, not communicated to officers, or simply dismissed by the US Capitol Police, according to the Senate report. Additionally, once the insurrection was underway, the Department of Defense did not authorize the deployment of the Washington DC National Guard until a full three hours after it was requested to do so by the police.

In a statement issued on Tuesday, the US Capitol Police said it welcomed the joint Senate report on the January 6 insurrection. It added, however, that “at no point prior to the 6^th [of January did its analysts] receive actionable intelligence about a large-scale attack” on the US Capitol Complex. This is likely to be the last Congressional investigation into the attack on the US Capitol Complex, as Republican Senators have blocked the creation of an independent 9/11-type commission to investigate it.