All of the law enforcement officials have blamed failures of intelligence, saying they didn't realize the severity of the threat, even though extremists were planning some of it openly online.
Many of the questions have centered on the FBI's handling of a Jan. 5 bulletin from its Norfolk, Virginia, field office that warned of online posts foreshadowing a "war" in Washington the following day. Capitol Police leaders have said they were unaware of the report at the time, even though it had been forwarded to the office.
The Capitol Police also did its own intelligence assessment warning that Congress could be targeted on Jan. 6. But that report assessed the probability of civil disobedience or arrests, based on the information they had, as "remote" to "improbable" for the groups expected to demonstrate.
Four House committees are probing what went wrong with that data collection, including the House intelligence committee. California Rep. Adam Schiff, the chairman of that panel, said his impression is that those failures "contributed to the tragedy on Jan. 6."
"We need to answer the question why and what do we need to do differently," Schiff said in an interview this week.
FBI Director Christopher Wray testifies before the Senate Judiciary Committee on Capitol Hill in Washington, Tuesday, March 2, 2021.