House panels reviewing what intel agencies knew before deadly Capitol siege

The state of play: The letter, signed by committee chairs, was sent to the FBI, Department of Homeland Security Office of Intelligence and Analysis, the National Counterterrorism Center and Office of the Director of National Intelligence.

• It requested relevant documents and intelligence associated with the deadly Capitol siege.
• It also requested the agencies hold several briefings in the coming weeks.

What they're saying: "Security and logistical preparations before January 6 were not consistent with the prospect of serious and widespread violence. Yet, according to media accounts..., federal and other authorities earlier on possessed ... intelligence and other information forecasting a dire security threat against the Congress’s meeting to certify the election results," the panels noted in the letter.

• "The Committees will conduct robust oversight to understand what warning signs may have been missed, determine whether there were systemic failures, and consider how to best address countering domestic violent extremism, including remedying any gaps in legislation or policy," the panels said in the letter.

Go deeper: The Capitol siege's QAnon roots