US Capitol security officials who were ousted in the wake of the 6 January attack on Congress have blamed intelligence failures for the breach.
Testifying to a Senate committee, the officials said that the rioters "came prepared for war" with weapons, radios and climbing gear.
Ex-Capitol Police Chief Steven Sund said he had prepared for a protest, not "a military-style coordinated assault".
Four people died after pro-Trump protesters stormed the US Capitol.
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