Review of the Events Surrounding the January 6, 2021, Takeover of the U.S. Capitol: Flash Report: Operational Planning and Intelligence [open pdf - 142KB]
From the Executive Summary: "On January 6, 2021, a physical breach of U.S. Capitol Building security occurred during a Joint Session of Congress to certify the Electoral College vote. [...] This is the first in a series of flash reports OIG [Office of Inspector General] will produce as part of its ongoing review of the events surrounding the takeover of the U.S. Capitol on January 6, 2021. Therefore, we may still perform additional, in-depth work related to those areas during our review. We anticipate that our next flash report will focus on the Department's intelligence operations and Civil Disturbance Unit."
Capitol Police, Office of Inspector General, Report No. 2021-I-0003-A
Federal Depository Library Program Electronic Collection Archive: https://permanent.fdlp.gov/