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Here is a link to the complete 125-page report entitled Examining the U.S. Capitol Attack | A Review of the Security, Planning, and Response Failures on January 6.
The report just released today, June 8, 2021, includes recommendations as well as a timeline of what occurred at the Capitol on January 6, 2021.
For an abbreviated but very complete news report, see the UK Daily Mail online news article headlined US intelligence agencies KNEW Trump supporters were posting threats and maps of Capitol tunnels weeks before the riot but didn’t share warnings with helpless Capitol cops, Senate report finds.