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 Washington Post: Before - During - After - Red Flags As Trump propelled his supporters to Washington, law enforcement agencies failed to heed mounting warnings about violence on Jan. 6.

This investigation is based on interviews with more than 230 people and thousands of pages of court documents and internal law enforcement reports, along with hundreds of videos, photographs and audio recordings. Some of those who were interviewed spoke on the condition of anonymity to describe private discussions or sensitive information.